1. It doesn’t really explain how it works and what you need on the receiving side. I use a Linux PC and reading the instructions always seemed somewhat convoluted, which makes sense - a proper way to enable your phone as a webcam would need functionality that requires root privileges in my opinion.
2. The android app is closed source, which I try to avoid. Not a big problem but I’d prefer something open.

So no big points, but I’d prefer a native solution, as in plug in your phone on PC and have a full webcam available as a source in every program.