Yes, you right. But go2rtc is not just about RTSP.
It can support RTSP, RTMP, HTTP, MJPEG, HLS, USB Cameras, HomeKit Cameras, files, etc.
Also it can convert codecs when it needed and do other nice things with ffmpeg.
Also it support 2-way audio.
Also it can stream to RTSP, WebRTC, MSE, mp4 (in development), HomeKit (in development)…
Also it has better support for WebRTC with external access.
And many other things in the future… 