STUN doesn't relay. It assists with P2P connection setup. TURN relays, and is intended as the path of last resort. The vast majority of WebRTC traffic is P2P.
The vast webrtc traffic is in reality between a peer and a sfu (selective forwarding unit) on a server. There is almost none real p2p webrtc traffic happening in reality because most people don‘t have enough upload bandwidth to transmit their video to all participating peers.
> There is almost none real p2p webrtc traffic happening in reality because most people don‘t have enough upload bandwidth to transmit their video to all participating peers.
Many providers choose to use SFU's even when not needed because they have features like recording that require it. I've gotten much better quality and latency on normal webrtc than I have over slack, teams, hangouts, even over bad mobile networks.
