While I can’t see it dying in anytime soon in how many visitors it receives, the general “vibe” and communities of the site will differ I imagine and that’s what matters to me. The end of Apollo was it for me. Like you said, others can do whatever but I’ve left.

Depends on how you define "Active Users".

Reddit has shitload of spam, bots, and lurkers. Only a very small slice of users actually contribute anything in the form of posts and comments.