Can't be 100% sure of course, but it looked VERY fishy to me and another player as well.

Game started 8:22:43pm US Central Time on Amsterdam server, was Tournament Match.

Near end of game, BIUX had
1) most VP
2) more money than his nearest competitives
3) was governor
4) at one point during this sequence of events was moving along the Astral Plane path

kameGui, easily in last place, took several opportunites to stop the other 3 players but did nothing to stop BIUX. By itself, just arresting me was probably a bad move but not evidence of anything fishy by itself. But after that when he had a chance to swap BIUX completely off the astral path and instead swapped a player adjacent to him which did nothing at all (and didn't help himself either, he didn't even appear to be trying to gain VP at this point).

It wasn't just me with this opinion, you can note by the chats/emoticons that caldrons very obviously thought this was assisting a teammate as well. Obviously I cannot be 100% sure there was mutual collusion but kameGui very clearly seemed to want BIUX to win and essentially handed it to him rather than allowing there to be competition, and wasn't even trying to get out of last place himself.