If an Admin is online, he'd kick these guys, and warn them about it. What you think should we do ban them now? I think for now they can go free, but in case you see the same guys doing it again, I'd suggest you to report them again, but linking the old demo and the new one, so we notice, they did it more than once, after that a ban would be okay.
But I don't see a reason baning somone for not following a little rule. I myself would kick, prolly quit them
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Thanks for reporting. / This is a official warning to these three players.