Actually, when you DC, you already receive the "loss" punishment regardless of the mode you're playing. And if you DC often enough, you get a soft-ban for 3-5 minutes I think. The timer starts the moment you receive the "We have to drop the ban hammer on ya" message when trying to join a match.
As for "not moving", people deliberately move around doing nothing when throwing matches in order to not DC. People who don't move *at all* will time-out, disconnect and receive the aforementioned punishment. So yeah, when someone has been doing nothing but mope around in Spawn, that's not someone being busy with life, they're throwing the match. Naturally things can happen, but it's still advised to make it as unlikely as possible to be interrupted before heading into ranked modes. Do your homework, kids and squids.