@vantablack And how exactly this preemptive blocking is supposed to help? In my opinion it is likely to have the opposite effect.

Suppose Meta launches something which won't be a failure right from the start. Some people come (and with marketing effort there could be quite a lot including some interesting personalities) and they will be isolated from substantial chunk of Fedi. It won't be good for either and the "free part" will likely be marginalized like it happened with the darknet.

I'd rather let Meta do the blocking, I am sure there won't be any shortage of that.