TL;DR Tbh I think most people just stayed on reddit or are here.
Totally gave up reddit in favour of kbin/lemmy and discuit. I'm quite happy using both at the moment as they serve different purposes: kbin gives access to a lot more content, especially memes and news related so I'm 99% of the time a lurker here.
Discuit is still a very small community and favours more discussion based content, but since they just added image post support that will probably change. There's only 4k or so accounts and a lot of people who migrated from Squabblr due to the main admin's attitude or something. It's mostly a pretty relaxed place with a few rocky moments and the admins are nice, anyone harassing other users gets dealt with pretty quick as it's still small.