It's interesting to notice that Apple is earning essentially $0 per year from the presence of Facebook on the app store, while Facebook is earning quite a bit from their iOS apps. Facebook has no leverage here.
Facebook could make news that's negative of Apple trend more than positive news.
[1] Superpowered Android audio latency test database shows how awful Android web audio latency is:
Just to confess - did use Facebook in the early days but I've been clean for 10 years.