It becomes a game of whack-a-mole: but if you as a poster or sender of messages don’t know that some of the relays that you post to are now blocking you (because why would they tell you?) then you basically become shadow banned.

Until your followers realise they haven’t heard from you in a while and start looking for you and start following one or more of the relays that you are still connected to.

That is why having lots of relays in lots of different jurisdictions is very helpful agains government interference.