Be Wiser! DF commence withdraw penalty affects your party.

[BobbinT]

3rd case: I'm pretty sure that you can immediatly report the party leader to the GMs. They probably don't have the power to remove a strike from your account for the day, but at elast, if enough trolls are getting reported and get a tell from a GM, the practice will stop.
For the exceptional case of a new player trying to do a specific dungeon, I'm pretty sure the GMs can take action accordingly.

I actually kinda pity the guy at the time, although I admit was being a bit upset. Think that one was not a serious case to be reported. It does happened in 2.3.