Yeah my guess as well. The Reddit blackouts have been going for quite a while, and the 3rd party apps are still going. There's no reason why we would suddenly grow 300K in a day
I personally was able to go a week without reddit and just be a normal person. The need for a replacement grew. And lemmy has been picking up enough thy I feel like I can come here whenever I pick up my phone and have a decent chance of getting content for my dumb chronicly content addicted brain.
So yeah. Probably a bunch of other people doing the same. I finally created an account yesterday after a bunch of days lurking.