I don't think it's censorship, I think it's more about marketplace monopolization. If I understand correctly, apps on the App Store are exempt from the notarization requirement (I guess because the submission process already requires them to know who you are). Each macOS version for the past four versions has steadily made it harder to run non-App Store apps, because of course Apple would get a cut out of the store sale (and not one from a Steam sale).
The counters for this are either consumers walking away from the ecosystem (we'll see how this and the ARM switch go down, but my suspicion is the Mac gaming audience is too small compared to the people happy with playing iPad games on their Mac via the subscription service) or some kind of antitrust investigation (similar to how Microsoft was hit in the early 2000s over the IE/Windows monopoly). The US government is currently looking into the big tech players over the walled garden approaches and potential misuse of market dominance, and big tech is drawing a growing number of lawmaker critics from both parties...but I don't have much hope that it'll amount to much. Europe is the one that actually took action against Microsoft, so I think Europe would likely have to lead the way again (if they can get Ireland on board).
In the meantime, Apple will continue replacing their old userbase with the new everything-from-Apple one. Mac is less than 10% of their sales; they're more interested in driving subscriptions to their services now.
I do find it sadly ironic that Mac seems to be the
hardest platform to develop for now, when it used to be one of the easiest. Early versions of OSX shipped with free development tools. At least when I was in college it was much simpler to develop for Mac via the built-in unix shell than it was Windows, but now that seems to have reversed.
I am a little disappointed that PS2 won't be out on Mac, but I understand the business decision, and I don't represent the interests of the average Mac user. At least my computer has bootcamp, so I can flip over to Windows 10 to play all the other stuff that will be dropping support. (Also,
WINE has 32-bit dependencies, so that solution is out. If it makes you feel better, it caught the
Square Enix team off-guard, since the mac port of FF14 uses WINE and now doesn't launch.). I'm not a fan of the "build and fix everything yourself" attitude Linux distros have, I'd rather spend my free time using my programs, not fighting them. That's what initially drew me to Mac over Windows in the first place.