Seriously, why do you collaborate?
There's no prize money and collaboration doesn't require any technical skills so I'm struggling to understand what you get out of collaboration besides wasting everyone's time.
It's one thing if it is the only available strategy but if a player uses it as a first option rather than take a RISK then I'll block them. Nothing is more boring than a game populated with players all vying for second place.
Just played a three person collaboration or a person using three accounts -- all with the Croatian flag. It was such obvious teaming. This is the second time I've seen this recently. Clearly there are not enough consequences. As a player, I should be able to see how often another player has been flagged for teaming from people who have played them.