I am not sure what the solution to this is but:
1. Facebook are a law unto themselves (so nothing we or anyone can do will change that)
2. We can counter this by promoting the alternatives and mention facebook at a bare minimum, or perhaps refer to them as face**** it may mess up search algorithms (not sure)
3. Keep doing what we are doing here on fediverse, build communities, generate content, communicate and interact, make people feel they are missing out by NOT being here.
4. Keep the orginal post in mind, when deciding on what to do should face**** decide to set up their own AP services and try and join the fediverse, what are their intentions, we are here and care for privacy, they don't care about privacy.