Nothing. However, some large instances could belikely to defederate whatever instance they sign up on and it could become a liability. You could also choose to defederate or block them yourself I think.
If you are usually a reddit lurker and are on here, it would be cool if you can try and engage with communities for a bit, just to try and get the ball rolling :)
Mexico supreme court decriminalizes abortion across country (www.theguardian.com)
Why is my food making lightning? (i.imgur.com)
r/The_Donald has been banned on Reddit, what's to stop those users turning Lemmy into what became of Voat?
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I'd like to encourage people on the fediverse to comment/upvote/post more than when reddit
If you are usually a reddit lurker and are on here, it would be cool if you can try and engage with communities for a bit, just to try and get the ball rolling :)