Probably not many using only that relay. But for anyone who signs up new on Damus it is one of only 2 default relays that they can write to. Damus has 4 bootstrap relays, and two of them are paid write access (read-only otherwise). Many users won’t know to add other relays, so if Damus relays rate limits them, then they’re limited to only that one other non-paid relay unless they add more.