How other guys can find my autogenerated domain link?

question
1

Can anyone find my domain link in some place like marketplace or list of servers? I mean can anyone who I didint say my domain link find my domain link in playit.gg?

We played with my friend and one guy connected to our server. But we didnt say the address to him. How did he do it?

He did it twice after my friend recreate the tunnel

2

There are server scanners that scan the web for servers. he could just have one those and that detected your server. if your server has a whitelist i suggest using that if you dont want randos joining