I disagree from what I’ve seen so far. Most of the discussions I’ve seen lately about newly migrated reddit users have been folks who were lurkers or mostly lurkers. I myself used to be active on reddit years ago, but have been a lurker for a good 6-7+ years now or so. I think you’re correct as of a few weeks ago when powerusers may have migrated earlier, but I think the migration post-API implementation has been a large amount of non-powerusers. Of course, users that are 100% casual, and don’t have accounts at all or only rarely used Reddit, and might not even be aware of what’s going on, those folks I’m sure didn’t really move.
Imagine if other similar formats sued each other like this - one forum site suing another because they both use text-based forum communication. I’m so tired of facebook/meta/twitter/etc.