Unfortunately there are some communities (especially gaming ones) that just don't have a Lemmy equivently or don't have enough critical mass to be useful. I would say Lemmy is a great addition, but not a drop in replacement.
Edit: Did some research, sounds like a few apps got API exceptions because they are consider accessibility apps. Am currently test driving RedReader. It's not bad and so far ad free.
I had a friend describe it at a party we were at and I didn't belive him, so I went and downloaded a Linux iso real quick and we watched it. I wish I hadn't.