Generic USB Webcam not recognized by FaceTime.

While I understand your frustration, this is a user to user forum for helping other users and we do not deserve tongue lashings.

If you wish to voice your concern and frustration at Apple, you can do that by using their feedback links.

https://www.apple.com/feedback/macmini.html

https://www.apple.com/feedback/macos.html

Not sure if this will help, but try quitting FaceTime and other App's that use the camera and see if Skype can access the camera. also see > Use an external camera with Mac - Apple Support

had the same issue once, had 2 webcams connected one noname and logitech

photobooth would work with both

but facetime would only see the logitech

the nonname was pretty poor image quality so I guess viewed that facetime had a quality requirements or something