In case you didn't know, the *arr stack use multiple services they host themselves:

- Radarr uses api.radarr.video: https://github.com/Radarr/Radarr/blob/7e3f80c98d01481430ab35...

- Sonarr uses skyhook.sonarr.tv: https://github.com/Sonarr/Sonarr/blob/c018578e4b79ee048575c0...

- Lidarr uses api.lidarr.audio: https://github.com/Lidarr/Lidarr/blob/28ab333eafa138a72319e4...

- Readarr uses api.bookinfo.club: https://github.com/Readarr/Readarr/blob/0b79d3000d4e5f8425f4...

I do agree with what you said however.