There is a saying... "With great power comes great responsibility". Unfortunately these days people are beyond irresponsible and you're bound to run into people who abuse that power. The GMs in this game are notorious for doing just that. I had a problem with a GM who abused his power and was constantly on my back just because I wouldn't bow before him and kiss his ass like everyone else did.
Eventually I gave up on the game until I heard that he "quit", then I came back and it was true. He was gone and now i've been more and more inclined to get back into the game. Anyways, don't worry about if a GM abuses his/her power. Just hope they "quit" sooner or later.