Disassociating with old comments and posts would be a good way to go, but I’m not really sure that’s an option for the fediverse? In theory couldn’t someone in the future set up an instance whose sole purpose is just back up and collect data? How would someone even go about trying to erase themselves from a situation like that?

There is one worry I have about Lemmy being the knowledge of anything and it’s what happened on reddit. Many people went through and nuked their comments, essentially making many posts useless. There are already people here on lemmy that delete their profiles, comments and start over every few months. Not really sure what that means for all the federation, but I assume different instances may have different versions of deleted information in the long run?