Re: So you’re complaining that
Let's think about that:
"- app hosting, - distribution and download"
You do know those are the same thing, right? Apple isn't hosting Proton's services, just a copy of their mobile binary. Proton has tons of servers. I think they really could handle having users download the files from them.
"billing and payment processing, VAT collection, multi country access"
Proton already has implementations for all of those things. Credit card processors do not charge anything close to that. So in fact, that is way higher than the price anyone else would charge for that part.
"additional in-app purchases should you require them"
What does that mean? They allow you to sell in-app things and collect 30% on each of them, nothing else. Was this written to pad the list?
"in-app advertising (not that I am a fan)"
Proton doesn't use it. Also, that is not included in app payments. That's an additional thing which Apple and others provide and there's a separate financial arrangement with it. So it's irrelevant for two separate reasons.
"Try working in retail"
I hope you recognize the difference between shipping physical things, keeping inventories, having salespeople, handling customer complaints, and all the things that retail does versus sending a file when requested. Yes, it's more expensive. That's because it does useful things, rather than Apple who get that by selling access to IOS users only. If a store near me was making its money because I was only allowed to shop there, that would indeed be a problem.