Currently you don’t get notified you got banned.
If I was able to transfer my block list, I’d like to try an instance with more up time, but I don’t want to ban evade. How am I even supposed to find out? It’s not plausible to go through modlogs of every single federated instance looking up my nickname.
If that were true, we wouldn’t be having so much user migration. So far moderation on fediverse lacks any transparency and frequently appears to be power tripping.
Otherwise, block function exists.