Getting banned is a lot more likely than you think. If you make "Fake" giveaways, and the winners never get to receive his prize, you're banned automatically I think. This is where the little "Percent Received by Users" thing on a gifter's profile comes in hand. If the percent received by users is a round 0.00% (Red X), it's an insta ban. Gifters have one week to send their giveaway prize before the percent ads up/down forever.

People always get banned. Just be sure to read the FAQ.

One is automatically banned if one doesn't give a mod cookies when one ask if one can get banned.

Do they get banned from Steam too? :o

I'm amazed that you think that they wouldn't have the power to ban people on Steam. They surely are godlike.

....
Want to find out? I know people. I can make stuff happen man, bad things, man!