So the reason r/bind has already jumped to an alternative is because they are affected the most and the hardest.
The other kind of communities today that you mentioned are less impacted, so they can continue .. for now.
I do hope though that the right groups of people are looking into creating the better alternatives right now. The day may come when reddit decides these subs are too much of a liability - or even just not enough of a money maker - and yanks them. And there's no reason to believe that reddit would give them even as much warning as r/blind had.
Emphasizing not a suggestion to move right away, but make sure these places can start establishing backups so they don't exist solely at the whim of reddit.