Browser-based screen sharing is the subject. Is it normal to advertise unrelated projects in HN comments?

I don't know. Is it?

The afore mentioned webapp is based on WebRTC so, not totally unrelated.

I have nothing to advertise as I have nothing to gain from this. I just wanted to offer additional solution for people that might find it useful.

Also, judging by the other comments, it seems that someone did find it useful.

Furthermore, reading through other comments on this thread, there are a lot of other WebRTC projects mentions anyway, and many of them have nothing to do with screen sharing.