Planned between three teams. Yes collision.
Simple question really.

Don't understand people's confusion.
Sure, but who cares? Coordination of screwing someone over on FFA waivers is no different then those people just picking the players up independently. This actually increases the competition in the league which in 100% of cases is a good thing.
The worst thing that happens in fantasy sports is teams giving up after 8-10 weeks because they can't win. That screws over competition much more often than actual consequential collusion ever does. The 2-10 team who gave up 4 weeks ago facing the guy who has to win to make the playoffs happens all the time. Two guys making a completely uneven trade in exchange for something probably happens on rare occasions.
This case appears to be a case of "#### that guy". I don't know what he did to piss off 3 other people that they want him out of contention, but he did something. Maybe he messed around with their sisters, or left them at a bar when he was the DD. Maybe he rejects all trade offers not vastly in his favor. Who knows?
Sure by definition its collusion, but it's completely inconsequential. If the guy getting "screwed" is affected, it appears (with what little info were given) to be his own fault. People don't go to planning on screwing a guys playoff hopes on a whim