There's PVP and CO-OP too.

"good faith" is a human concept. Corporations aren't people, they don't act in any faith. They haven't yet fucked it up, but that means literally nothing. Trust is an irrelevant concept here.

All it takes is a bad quarter, a new exec wants to prove their worth, a news article makes Microsoft look bad for hosting piracy software. Anything could trigger the change. Whatever or whoever is stopping them from making this mistake isn't going to be around forever.

Sure, they don't rely on consumer sales, but that creates a contradiction. They have an anti-piracy system, so they nominally care about it. That creates tension that will never be resolved in favour of piracy. They will eventually crack down against their own interests.

I don't even know why you'd argue about this. Maybe lightning will strike on this issue and it won't get removed, but if it makes a difference to you you're better off assuming it will happen.