This is ridiculous. If you develop a game that needs to be available on all major platforms, Apple devices are a part of them.
Are you also one of the people, who would argue, that you can build you own road network, if you don't like the terms on the current road network?
Luckily it is not you who are going to work on these regulations, but people who actually care about free markets (how ironic that the EU is the progressive one on the question of freedom).
There is such a thing as a private road. This is not about access. This is about money, and to think the EU - the geniuses who gave us all GDPR pop ups - don't have a intrinsic interest in devaluing Apples ecosystem is delusional.
The GDPR didn't "give you" pop ups, it just made it mandatory for companies to seek our consent before they abuse our personal data. Many companies chose to be as obnoxious as possible about it to annoy you into agreeing. You need to rethink who you're directing your anger at.
As a matter of practical advice, there are optional filter lists for uBlock Origin that block the vast majority of consent popups. I barely see any these days.
It was not part of GDPR, GDPR also says that giving and removing consent should be equally easy and not remove functionality (like disabling the whole website with a transparent black background) hence the vast majority of the cookie banners are illegal.
Blame companies for illegal behaviour, the EU's rules are supposed to give you the information about how/where your private information is being shared. That's genius, and you should be grateful that now you know how much your personal information leaks.
You can call Apple a customer or supplier of Epic, but it's just semantics they do have a business relationship.
The deeper point is companies get rid of litigious business partners whenever possible. It's one reason why you end up regulating utilities, nobody wants the electric company to have excessive control over the local economy. Where exactly digital platforms sit on this spectrum is probably a question for legislators not the courts.
It is this relations that is the core of DMA, and which DMA seeks to change.