From what I've seen they do care quite a bit about gaming, but not to the point where they're willing to actually do much about it, so I wouldn't expect a proton style compatibility layer anytime soon unfortunately
If they aren't willing to do much about it, they don't—however much they might pretend as long as it costs them nothing of value to do so—actually “care quite a bit” about it.
But I think it comes down to the wording a bit. At their core, the only single thing Apple cares about is making money. They only pretend to care about their computers, phones, everything they do is just an act, but we all know that so caring about something is relative, when we say they care about their computers its more that they put more resources into that than they do other things which we'd say they dont care about.