I have a habit of taking casual glances at other people's phones (don't @ me), and I can tell you I can count the times I've seen someone use an alternative Reddit app on one hand, where as the official Reddit app is semi prevalent.
It's really just us nerds that make the move to somewhere else, casual users would never have bothered.
I think it will be a long time until you can find casual lifestyle advice on Lemmy, if ever. Most people have a hard time grasping what the fediverse is, why it's supposed to be good and figuring out how to follow people on mastodon. We'll stay niche for a while
For anyone interested, there is a forum thread which is the closest thing we have to a live blog, along with the thread author's opinions on how veritable the claims of each party currently known to try and replicate the study are.