Google Shopping was fined over less: https://www.tnooz.com/article/google-shopping-decision-sets-...
Large companies, particularly in the EU, are not allowed to throw their weight around to privilege their own services and apps.
Large companies, particularly in the EU, are not allowed to throw their weight around to privilege their own services and apps.
Google prioritizing their offerings over other vendors on a search they control is far different than "Can't post on Facebook from Twitter".
Google has put itself forward as a fairly agnostic search. No one signs up to be indexed by Google. It works more like a common good. So when Google starts offering a service, then puts its own offerings before others in its search. That's dirty pool.
But that's not what's happening here. Facebook is a platform to connect with other people who are also on Facebook. It doesn't purport to be a central hub for anything but Facebook. It's just not allowing Twitter (and others) to post on users' behalf.