the other option is to build clients that allow you to stop rebroadcasting on a relay level… then white list the clients that support this in some manor. the problem with this is one person who doesn’t check that box and now you got a bunch of tidal links being spammed from the topic specific relay that is just to host the song your currently listening too to all the other relays that person has listed. So it really should be something a relay says to the client.