Isnt this a game built around common courtesy though?

You try to do an NM, others are already there. Both groups take turns.
People generally take turns cause they fear if they don't they will get outclaimed out the wazoo, if they had a tool to insta claim and only they had it they wouldn't take turns at all, ever. I've been in positions where I asked to take turns when I arrive, they ignore or say no and I outclaim them for 4-5 in a row, then they get talkative. So no.

To OP, if you don't like it make your own group. He made the group, he makes the rules, if you don't like them don't join it.