I think here the exclusitivity is understandable, since the the tournament is at least partly funded by voobly official, and because it is a small tournament. MoMR wasn't funded by memb, it was by leppard and geterix, which happen to be mods in memb's channel. I don't think when they sponsored MoMR, they perceived themselves as representatives of memb's channel. props to them.
Just to be clear, the donation from vooblyofficial for this tournament has nothing to do with the desicions Nili made, regarding this tournament.