What makes you think that 3% cut is enough?
But Apple can ask whatever they want. They can't block side-loading though. That's the uncompetitive part.
You can run your store and pick whatever terms you like. You can't use your marketshare in hardware sales to bundle a forced store.
Imagine Tesla charging you 30% of any grocery shopping (i.e. would refuse to open the doors if the store didn't share 30% of its gross revenue).
I mean, its literally, textbook anti-competitive. The App Store as a store isn't competing fairly, on its own merits.
Also keep in mind, that this whole getting raped with transaction fees is a 'america-only' thing. This is much better regulated in the rest of the world.
Specifically the costs are fixed, so anything that is a percentage is just fucking nonsense. It doesn't cost more to charge 5 euro's than it does to charge 1 euro. It uses the same electricity, the same personel costs. There is a point where its get more expensive because of risk management, but thats above 100 euro per transaction.
Percentages on transactions are generally only allowed when its a loan. Which is why Americans are always buying things with credit cards ("loaning the money"). Most people pay for things with their own money, not with a loan. (i.e. direct bank transfer). And those transactions have a fixed transaction costs. Worst case 1 euro (low-volume, your personal webshop) all the way down to 5 euro cent (high-volume, i.e. the supermarket).
So explain to me where the hell you get your 3% from? You just sound like an already boiled frog saying 'are you sure we can survive in cold water?'
You can't. You can't know if whatsapp was replaced with whatsapp that syphon your data.
"Don't side load then." is a poor argument.