Once upon a time computer games were text based, then they added
graphics, then they began to support real time active graphics when
played in multi-player environments through the internet. The
bandwidth requirements of many of today's computer grames is
significant. For example, Counter Strike has been measured as
requiring 115KBps for clients in some situations.
Some internet service providers are starting to impose bandwidth caps on users (what they are starting to cap is aggregate data consumption per month, at a level much lower than their claimed instantaneous bandwidth). Often the proposed caps are so low that a couple of hours of game playing per day will easily exceed the monthly cap. This is why you should be complaining to the appropriate legislators or regulators about these proposals, at least in those situations with the proposed caps are absurdly low and intended solely to provide the them with an extra source of revenue.