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.

I’m always suspicious of apps which setup a local web server to accomplish some basic task. When Zoom did this, it was a security nightmare.

Just based on the screenshots, DroidCamX sets up a local webserver on the phone, and then the video is accessible on the local network (for example: http://192.168.0.17:4747/video). This means anyone on the local network can access the webcam, which in an office or school setting, might be disastrous. If a coworker were in a conference room using this app, a malicious coworker could use this to spy on the meeting surreptitiously.

However it’s implemented in the OS, a basic requirement is that there is some authentication to link the phone’s camera to the computer, and that the video is encrypted in transit, to avoid man in the middle attacks.