Is it my imagination that a lot of Jellies have changed their avatars and/or user names in the last couple of days or weeks?

There seem to be a lot of “new” Jellies with 3000 or 4000 points that I don’t know. Where did they all come from? What have I missed? Am I getting senile in my middle age?

Do Jellies make a habit of changing their user names or avatars often? Have you?