The Privacy Policy/ToS has been updated with following clarification :

Sadly, even though we have warned people about it in the past, it has come to our attention that there are players that reach safety ranks in Colosseum and then strip down to get chained by their friends, so that they can gain easy CPs. We had such a case recently, and we decided to ban that player for 3 days as a warning, while also investigating any players that participated in this situation.

It needs to be clear that such behaviour will not be tolerated. In the future, participants in similar schemes will face bans and loss of a fraction of their CPs.

Please do not bring us in the unfortunate position to enforce such decisions. Play fair and enjoy the game !