Frankly, I would have no problem with this going into effect for new customers, or after the current contract with existing customers have been completed (ie 1 year).
The fact they are adding this immediately and will terminate anyone who goes above that amount twice, in a 6 month period, is wrong.
I'm wondering if this is a violation of certain State's laws, my AG is a real pick (I had to remove the R for the filter) and loves to chew up companies like this.
If Skuzzy reads his, could you/he post how much data AH uses min/max per hour?