If they find that it's hard to attract talent, they'll also pay well for remote. But if they don't, angrily worded letters are not going to be the thing that makes the difference. People are going to have to start voting with their feet before Apple will see the supposed error of their compensation formula.
Many companies are. Traditional, old school companies like Google and Apple are slow to move here, but many tech companies are moving to a "we pay you your value, not your cost of living".
I've only seen one (Airbnb) but perhaps there are others I've missed. I don't think we will be able to know how it is going to play out for a couple of years. They may validly intend to do what they say today, but market forces may ultimately force them to change their approach. I'm happy to wait and see personally.