Hey, i just would like to ask if some kind of shit is illegal and if i should report it.

I just joined a duel server, the mod that was set is aikidobigdojo.tbm
After i joined the duel mode, a person changed motd to -BEWARE! turnframes500-
I got confused, and just lost to his tripod opener.

Is it even legal to do such shit? I wasnt informed about the change at the moment of start of the duel, so i find this very and very unfair.