It's creepy. Like someone looking over your shoulder. Before it became normalized, that wasn't a niche opinion. I'm sure it's very useful for developing software. A camera behind me pointed at my screen might be even more useful[0]. Both are invasive and gross.

[0] Session-recording spyware "telemetry" products practically are this, and are widely used. Watching their session playback, or ability to monitor live users on "your" site (but actually, on their computer) is disturbing.