Some more spitballing from a noob here, but I wonder if much thought has been given to account portability between Lemmy instances, or even Fediverse apps in general.

So far, from what I can see, accounts are pretty much siloed. Two opportunities off the top of my head:

Export your account, including all posts, comments, and user metadata and customization. This actually might be legally required by some jurisdictions, although I'm no lawyer. GDPR might not be applicable for one reason or another but I think the spirit of the law is good.
Single sign on. This is perhaps a little harder to implement, but it might be nice to be able to participate on another fediverse app without having to research instances and sign up. Also nice to try out different instances of the same app before committing to one.

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[–] ElectroVagrant 3 points 1 year ago

It's come up a few times, as well as what I'm about to mention, but it's still worth mentioning since it's expressly made to better enable this, the Zot protocol was made with a nomadic/portable identity in mind.

I'm guessing there must be a reason it's not been adopted though, but I'm not sure what the reasoning may be.