But it's unfair to Apple! They get 0.00 for this!
Bullshit.
Every Apple customer who wants to use HEY gets a great mobile experience to encourage them to keep buying Apple products. If enough services like Dropbox, Netflix, Spotify, were not available on iPhone, the consumer might purchase the Android phone on their next upgrade, or the company might switch their fleet to Android devices that actually support their business software.
Basecamp / Hey is providing value to Apple's products by enriching their ecosystem. They should have the choice if they want to pay a 30% cut for organic search traffic in Apple's App Store.
Apple is providing value to Basecamp/Hey by providing a smartphone and an operating system that can run Hey app. "Hey" can simply remove the app from App store and provide a web based version if they don't want to pay for convenience of iOS and iPhone.
Ten years ago 30% was entirely defensible. That it hasn't budged at all is a little weird. If it had notched down to 25% and then to 22% with a hope on the horizon of 20%, I think a lot fewer people would be so salty.
In-app purchases are a tricky one, for game-theoretical reasons. With in-app purchases your base app can be a loss-leader, and in an ecosystem where 'free' is allowed then you make more money with in-app purchases than you would with a monolithic app. We are already overusing in-app purchases, if Apple made them cheaper then everything would be in-app purchases. In-app purchases also make QA harder, so whatever curation power they have is diluted and usually not in a good way.
My heart says in-app purchases should have a lower tax, because Apple is doing less of the work. But my brain says that the opposite is the case.
What is really hurting the people I know (which admittedly isn't many) is that upgrade prices aren't really a thing in the App Store. They don't even have bundling options like Steam. Which means you have to cobble something like it together via in-app purchases.
In my experience, you will likely either pay for search results or do marketing on your own using other channels. Both are paid and Apple doesn't do anything for it.
There's really no good case for taking 30% as long as there's no real marketing benefit from the App Store.
And because discoverability on the app store is terrible, of the people who sign up through the app, it's very likely that the majority of them won't have discovered it through the app store.
As a thought experiment, if Hey adds In-App Purchase for subscriptions, but everyone who downloads the app has first signed up for their service due to their marketing methods (an increasing likelihood considering this controversy), then nobody will use the In App Purchase, and Hey will send $0.00 to Apple.
If someone discovers the App in the App Store due to an organic search for Email clients, then they are likely to sign up via In App Purchase, and Hey pays Apple an affiliate fee of 30% of first year revenue, and 15% of lifetime revenue after that. This is a customer that Hey would not have had if not for the App Store, so getting 75-80% of lifetime value seems better than not acquiring the customer in the first place.
I realize it's not entirely as clean as that, but cast in that way, the amounts seem merely expensive, and not egregious.
(not to defend any of Apple's behavior - particularly the most recent letter sent).