Why do you think that? You are only arguing that "monopoly laws" should be called "oligopoly laws". These laws require abuse of a dominant market position, not a majority share.
So Apple locks-in users to their platform (as is everyone else) then they are using the control they have over their user base to lock out competition.
This is the very definition of anti-competitive behavior.
If there was then patents, copyrights, trademarks, and fit of licensing, etc would all be wrong to the same degree.
Until a monopoly (or a collaborative effort by members of an oligopoly - in the case of price fixing) abuses these things we don’t care - and rightly so.
Plus, when it comes to media like movies, you really should complain about the movie studios & their licensing. That’s why Apple locks down videos - they have to or they wouldn’t be able to offer the content. You can see their free & easily shareable approach to music purchasing as a counter example to movies.
If Apple had an open platform then they'd be required to compete on quality and services. Instead they lock-in users and lock-out competing services from even being able to exist in their platform. This is anti-competitive.
Note that I say this as a user with a MBP, iPhones, AppleTV, iPad, etc... I admit I would probably be fine switching to Android (for example) if I felt the quality of the platform was better without fear of not having access to other services (but IMO the quality isn't there).
Let's look within the platform itself, though. This is a platform en-composing millions upon millions of users across over a billion active devices (https://www.theverge.com/2016/1/26/10835748/apple-devices-ac...).
Apple leverages its control of the platform to give Apple services an advantage over the competition. If Apple is not careful this will almost certainly end in anti-trust litigation.
Patents and copyright exist novel and interesting works and ideas for a limited amount of time. It's an obvious argument that it would be anti-competitive to allow a giant competitor to steal novel ideas from their creators without recourse. It's not obvious to me how protecting serendipity is clearly anti-competitive.
Trademarks are in no way anti-competitive. They exist to support fair business practices, in particular to prevent malicious actors from falsely claiming they represent a business. It would be anti-competitive to allow anyone to steal your trademark and sell products under it.
Apple does not make their services available on anything other than Apple devices, nor do they allow other providers on their devices.
Regardless of an open format for the content, I cannot choose to use another service without also completely changing platforms, and if I change platforms I cannot use Apple's service.
Secondly, you can absolutely use other services on Apple devices such as playing music bought from Amazon in the Amazon Music app, or using Pandora or Spotify. I use audible on my iPhone, and there's a perfectly usable kindle app. Apple Music works on Android, and you can transfer music bought in iTunes to any other device. Sure there are some limitations, there's no native iCloud client for Linux and it's support on Windows through iTunes is limited, but eh. There's a limit to what I think it's reasonable to expect them to do to make life more tolerable on other people's stuff.
What is monopolistic to you? Does it need to be over 50%? I don't think economists define it that way, they only argue that one company has excessive influence in a market, which means more power than the other companies in that market. That does seem to be true of Apple in the mobile app market.
Your statement reminds me of a reporter who said that Walmart can't possibly be a monopoly because it's revenues are "only" 5% of US consumer spending. It's scares me to death that a single company takes that much of the total, and it's silly to suggest that the largest company in the world by revenue can't possibly be a monopoly.
FWIW, the distribution of phones isn't the same as the distribution of revenue from apps. Apple brings in more app revenue than Google, even though more phones sold run Android.
https://www.statista.com/statistics/259510/revenue-distribut...
1) Market definition (to your point - in the tech world, this can get problematic very fast.) 2) Market share 3) Market share rank (i.e. 4% among a million competitors who all have <1% would be pretty significant) 4) Ease of entry into a market (i.e. Google gets a lot of scrutiny in the search market because of the consensus that to build a good search engine competitor, you need a lot of data for machine learning models, which a startup can't just get $ to buy and/or cleverly build with IP.) 5) Ease of customer switching 6) Pricing behavior ...among many others.
Historically, a lot of analysis & literature to demonstrate market dominance has been on elasticity of demand: e.g. if I as dominant company X adjust prices, and customer demand doesn't change (probably because there are no substitutes and/or the switching cost is too high,) then anti-trust regulators would probably be all on my ass. But in the tech world, new models are still being developed I think, as that concept is not 100% applicable.
It can have a local monopoly of course (and often does in many more rural areas) but that’s not the same.
I think I’ve been to a Walmart once in the last 10 years. I’m not even trying to avoid them: there’s no reason or need for me to go there and I have plenty of other (just as cheap) options.
That’s not a monopoly.
They’re a massive business and a dominant national brand but that’s also not a monopoly.
That said, your experience and you having other purchasing options isn't the only criteria, as @s3r3nity pointed out. Being on Hacker News probably means you're not in the lower 50% of the US population socioeconomically.
Being a massive business is precisely one way Walmart might be considered a monopoly. They're not a dominant national brand, they are the single largest global brand on the planet by revenue. The fact that if Walmart closed tomorrow, it would have a significant negative impact on the US economy is alone enough to warrant asking the question. When a company is "too big to fail" that automatically puts it in the potential monopoly category.
Also, there have been anti-trust cases against Walmart, some of which Walmart has settled. So it's really not super clear cut that Walmart isn't a monopoly.
[1] https://techcrunch.com/2017/10/13/ios-and-samsung-market-sha...
[2] https://appleinsider.com/articles/18/05/02/apples-iphone-buc...