Lolwut

There seem to be a lot of false bannings happening. And Nexon just turned loose their volunteer GMs. Coincidence?
Look at that guy, he's freezing up several monsters. Gotta be a hack.

Another possibility: Do you have bad lag? Lag effects can look like hacks to other onlookers. Always worries me when I train during real bad lag (2 or more seconds) and someone comes onto my map.

There were bans like this before the "volunteer GMs" came about. Also, it's easy to tell when someone is lagging and actually hacking. I have experience with judging the difference between the two. If you can't tell the difference between lag and a hack, you're not qualified to be a GM.

why is everyone blaming MWLB? They don't even have banning privileges. They are just glorified reporters. The GMs still do the banning.

Yes, there's no reason to blame them. Their reports simply weigh more than others, but it doesn't mean they can ban. They can report something, but a GM has to come look at it before banning.