Has gameplay harassment any consequences?

game 1397504
Firelotus ( the one i "enraged" a bit at ) has attacked every turn till he had nothing left, so all his armies are to 1 which obviously serves no point unless he wants to harass people(which he "said" he wanted to do) or favour someone.
But not entirely random : he seems to aim at removing bonusses of others except one person.
Now that last thing makes me suspect a multi but evidence is so thin , it was stupid of me to even mention it.
The real question is : can that kind of gameplay he is showing be given a warning or something else that migh possibly ever in the future straighten this guy out?
Firelotus ( the one i "enraged" a bit at ) has attacked every turn till he had nothing left, so all his armies are to 1 which obviously serves no point unless he wants to harass people(which he "said" he wanted to do) or favour someone.
But not entirely random : he seems to aim at removing bonusses of others except one person.
Now that last thing makes me suspect a multi but evidence is so thin , it was stupid of me to even mention it.
The real question is : can that kind of gameplay he is showing be given a warning or something else that migh possibly ever in the future straighten this guy out?