[JoshTriplett]

> You expect from any service that they can cancel your account for any reason

Yes, absolutely. "We reserve the right to refuse service to anyone." I expect to be able to do that for any service I run, and I expect others to be able to do the same.

I also expect that doing so lightly, without a very well-justified reason, would get reported on and lead to a massive backlash. So, in practice, I expect such a clause to be used as, effectively, 'if you try to find a "creative" way to weasel your way out of our specific terms like "don't be disruptive, don't spam, etc", such that your activity meets the letter of the ToS but not the spirit, we'll kick you off anyway". Personally, if I were writing a ToS, I'd write the relevant term along those lines instead.