Seems perfectly fair to me. Your heavy use of the system is affecting other users so they will lump you in with all the other heavy users. They are still offering you an uncapped service, just slower. Why should your surfing habits impinge on others who wish to use the service in a less intensive way?
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.