I remember the last time I tried to find a cheap webcam that works on linux, I gave up pretty quickly and just used my laptop for video calls. Saw this guide to build one with a zero 2, had a spare board in my parts drawer so thought why not. I'm surprised by the quality of it. I've been using it for work meetings.
So to use Teams for my workplace, there's a shit load of security OS shite that needs to be installed on your phone in order for it to work, I'm not doing that on my personal phone. They give out work phones, but my role differs enough from most peoples that having a work phone is a waste of time and pocket space. But I can join a meeting from a chromium type browser without issue. Also screen sharing can be useful in meetings. But yeah, you're right, 90%+ of the time, a phone is the better option
I think he meant you can use the android phone as a webcam for Linux. There are apps that let you connect via WiFi, and it essentially proxies the camera out.
Looking in terminal, it doesn't look like it can put out more than 30fps. It defaults to 1080, I have the camera 3 module. That said, there is some lag at both 720 and 1080, although it doesn't seem worse at 1080 than 720. Still, plenty good enough for it's purpose, which is just to put my face in the teams call.