Just as if you don't agree with Apple, you are welcome to use the alternatives. If you don't agree with GNU, you are welcome to use the alternatives.

That's exactly how this is going to go down, at least in my case.

Well if you'll switch away from Emacs because of coloured typeface, they you're not using Emacs at all anyways, so farewell.

More like, you chose to make your life more difficult by using free software on non-free OS.

Yeah, kind of true. But Apple not letting others implement iMessage is pretty similar. (I'm sure I could come up with examples for almost every other tech company as well.)

I admit it feels weird that GNU is doing it, since the others can be explained by them wanting to make more money, and this can't. But I guess we should be as understanding of them trying to "win" the thing they want (software freedom, defined as they choose) as we are are of companies trying to "win" (money).