If your business model involves fraudulently spying on the users and making money out of it, then too bad, that's your problem.
And about the arguments on "Facebook is free". I agree that Facebook is a free service, and they need to be compensated somewhat, but, if a user disables ad tracking, Facebook can simply block them from accessing their free service, which is fair, right? It's only a problem if Facebook continues to allow their free service to such users.
Well, even then I would think charging iOS users who block Facebook tracking is a fair deal, especially if there is a premium version of Facebook with no spyware in it, I totally see myself and many others paying for it.
But Facebook won't do that, because their core philosophy is just criminal - spy the users as much as you can without their consent. So, fuck them. I support Apple here. I hope Android follows suit as well and we can slowly kill Facebook together.