Don't use one, install only Apple approved content from Apple approved stores but don't force everyone to do so. If you want to pay 15-30% more for stuff from the Apple Store then you are free to do so. On PC you can use only Steam, if say you want to buy Fallout 3 today and is 75% of on GOG you are not forced to buy it from GOG, you can buy it from Steam and give Valve their cut.
But you should have bought Android if you want freedom ... I think it does not make sense that a judge should decide if somebody is abusing their power should depend on the market share of Andoid and would include a condition like "When Android market share gets under X or when Google locks down Android then the current Apple good abuses become over night bad).
No, all the websites I seen that offer mobile apps have 2 links, one for Apple and one for Google store . I never seen an app forcing a different store but I know Epic is trying to do that and offer some needed competition.
As far as the MacBook goes, it's a different target market. MacBooks are targeted for professionals that do all sorts of things with them.
Instead they are beefing up the iPad, which has the same target market as the iPhone. That target market doesn't care about all this crap and just wants their tech to work.
However, I would not purchase such a MacBook Pro. I would purchase such a MacBook or iPhone though.
I specifically bought Apple vs Android for these reasons. I run my life and business form my phone, I trust Apple to provide me with a working experience and support when needed.
Imagine having to use another App Store outside Apples control, and an app causes my phone to crash. Who will support me? I have to go digging to the app developer, or the App Store developer, or Apple?
Apple went this route to specifically remove the fragmentation of the PC market, and what you see similar in the Android market. The closed system provides better quality. That is why Apple is where it is today.