Well they already realised that early and so they built their own social networks and they are still up and running today. This 'censoring' should be unsurprising to everyone here.

I thought what happened to alternative social networks was a warning to show that not only they can do it to anyone but it shows how anti-competitive they really are.

What happened here to this person mentioning Mastodon is no different but was like 1% of what Facebook and many other private platforms can really do.