Nothing? In practice, if this were to happen on a noticeable scale it would mean Lemmy has gone mainstream. That said, within a federated system, it’s entirely possible to create isolated, defederated webrings - for example, networks consisting solely of invite-based instances. If something like this becomes a necessity, it might lead to formation of multiple such webrings and they might even decide to federate with each other someday.

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From what I know this is called dyskinesia and wiki article has some possible causes listed:

https://en.wikipedia.org/wiki/Dyskinesia

I’ve seen some medication list this as possible side-effect. Don’t know anything else about it.