Which ones are those? The ones I follow, mostly tech such as r/apple, r/iphone, and r/mac, seem to be back to normal.

All the subs I followed are a shadow of their former selves.. there's still some half-assed content posted, but it's not worth bothering to try and keep up any more

I was on a bunch of small niche subs with 10k users or fewer each

Seems like the giant subs like you're talking about are still running, although they're a lot lower quality now that it's effectively impossible to use Reddit on a phone