I find such arguments more than absurd,
1. They have no issue doing that on macOS
2. Apple needs third party developers as much as the other way around. They are not doing this for free, they would sell a lot less devices if third party Apps weren't supported.
The world does not own Apple any level of profit.
So there's not going to be any problem with putting limits on the amount of money Apple can leech. Nor will there be any downside to doing it. Apple will not put any less effort into their platform or tooling even if such limits were in place. Nor is there any chance that Apple will abandon the EU market.
(If Apple was charging a nominal fee instead of a punitive one, they'd have a much better argument. But for Apple, it's not about the money they make from the technology fee. It's about making sure that the regulation can't actually achieve its purpose of promoting competition, because Apple will have smothered the competition in the crib.)