It’s only 3 relays to
I just had a quick look and as suspected, it's all of the mostr.pub fediverse people posting that. At least from what I saw. That bridge is a cesspool nostr:npub108pv4cg5ag52nq082kd5leu9ffrn2gdg6g4xdwatn73y36uzplmq9uyev6 It's cool as hell from a technical standpoint and you're amazing to pull it off, but the content is less than to be desired by most.
Discussion
I am finding this stuff on damus relay too, it finds a way to broadcast