That would be awful, is that even possible now? How hard is it to start a new relay? At least for now it seems like a safer bet to find another relay than go to another big platform like Substack and hope they let you stay.
Discussion
It is possible and relays can do it right now. Relays are easy to setup, see my guide
https://git.poster.place/verita84/nostr
I also have a list of free-speech relays on there
My modified iris client uses all of those relays by default at https:/poster.place