Absolutely! And given that they have a gazillion users they can willingly move around they can drown us out in a day if they want
They will drown us out even if they don’t want in that case. Them just using the service normally will flood all our feeds with posts from their service based on the sheer number of them.
That’s why every instance worth its salt will defederate from day one
I expect to see zero posts from Facebook on my feed
I think (and hope) so too. Some pro leniency stances from mastodon bigwigs got me a little worried, that’s all.