@smacuser, didn't see your post until after I logged out but now that insomnia seems to be winning...
I've seen various reasons given from old timers from added work time to other posters dropping out so they did too.
In my case it's medical but I also see a lack of diverse threads. Shinyitis thread wiped out about three other threads dealing with more specific types of vaping, no offense to the shinyitis thread.
Oliver doesn't seem to much care about this site, if at all, any more plus there's almost no engagement from the moderators.
Moderation is a joke these days. Racist, pornographic and hard drug posts are allowed to remain on here even after multiple reports have been made.
After the last software update everything went to hell. How many of your "notifications" are correct?
CASSA, born on ECF, decided ECF wasn't worthy of making posts to anymore. I think they do now but I got very used to ignoring them after their lengthy absence. And considering the ground we're losing, they aren't very effective these days.
Vaping has gone mainstream so the "it's-all-about-me" crowd think they know everything. They don't and the video evidence shows up here repeatedly.
There's very few ECF "supporting members" here anymore so now "dry herb" devices are promoted on ECF but you can't talk about them.

I humbly vote drug talk can go elsewhere.
The bottom line answer to your question is an almost complete neglect/abandonment of this site, which literally probably saved my life, by its founder. It's heartbreaking. If this site continues to deteriorate at the rate it has, I won't be a supporting member next year.
I feel like I'm watching the death of an old friend.

Have you kept up on the farce that's the classified thread? They charge people money and never approve them.
ECF is dying and the person that can save it is AWOL.