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.
Second for Reolink. I’m just using local SDcard storage atm, but might consider something like Frigate, just hasn’t been needed yet. Got 3 cameras and 2 doorbells, all hooked into Home Assistant.