I don't think that initial peak was ever "real" anyway. I think it was due to people creating multiple accounts on different instances (or maybe even claiming multiple usernames on the same instance) before settling down with the one account they were actually going to consistently use.
Yeah that's me. I signed up for and used beehaw for a month before switching to my current lemmy.ca. My old account would definitely be counted the same way as someone who signed up, got bored and left
There are definitely people that bounced off Lemmy for whatever reason. No idea how many though, I myself had 4 accounts on various instances before I settled on this one.