Me (installing Arch): Amateurs!

Finally some good use for AI! I’d still prefer the original GTK1.2 version, though.

^^^ this. And for older phones, if I remember correctly, I used something like this like 6 years ago: https://camo.com/camera. I’m afraid it’s not open source, but it looked trustworthy at that time, and I think it worked in Linux (as a standard webcam) but I might be mistaken. Take it with caution but from there you can start searching and maybe will find better alternatives.