Personally paid for Niagara launcher as I find that to be the far superior launcher to any other I've tried. My second one is Symfonium, the most feature rich and well developed audio player.
The only other app I have paid for that wasn't a game is "iVCam" so I can use my phone's camera as a webcam that isn't limited to some stupidly small resolution or have a watermark, can do more than 30fps, and also works as a source in OBS. I mostly use it for full body tracking in VR with the April tag system. But I wouldn't say it's my favorite.
To be fair, I bought the app years ago when that wasn't a thing. But I also don't see webcam as an available option when plugging it into my PC. I have a carrier branded Pixel 8 rn, so it might not have everything a regular stock android would. :/
I can actually just use some FOSS thing I found on GitHub to basically remote access my phone now via ADB, which is also handy in VR as I can use a VR version of it without taking off the headset.