>Your example is about one developer's decision, which is not really what we're talking about.

Is it? Many games outsource their anticheat to a third party developer, similar to how many apps outsource their app security to play integrity.

>The damage goes way up when you start talking about an arbitrary number of applications. A more apt analogy is, what if you couldn't install any applications except through the Windows Store?

What about (nearly) all the games that only support windows, and worse yet, are exclusives on one distribution platform? Yes, there's wine/proton and cracks, but that's a "solution" in the same way that using a modded apk to get past the play integrity requirements is a "solution".