It really depends on what sub(s) you visit. Some subs didn’t have a lot of mobile users to begin with, so they didn’t see much change in their core active members.
The default sort/filter for the front page there is trash now. I typically see the same things hovering there for days.
This feels relevant
Sometimes the mods of overlapping communities will discuss merging, usually initiated when one of them notices there is little engagement in their own. But the general consensus in the Lemmy admin/mod population is that having overlapping communities on different instances is a net benefit.