No, Facebook. Facebook is telling companies to use the PSL. The PSL people are saying, “we give no guarantees about how long it will take us to add a domain to the PSL”. They could drag their feet so long as to make the PSL useless. To make sure it works, I could see Facebook wanting to get some of their people into position so that they can immediately approve PRs on the PSL.
I can’t think of any reason Apple would want to support the PSL.
I can’t think of any reason Apple would want to support the PSL.