[Jensson]

You get it wrong, she consumed $2106 worth of service and has paid $200 so far, that is a fantastic deal for her. Vimeo then says that next year since she consumed so much she will have to pay $3100. Vimeo here takes the risk that she gets more popular and therefore will cost them even more, they have to take a premium cut to cover for that risk.

A regular hosting provider would just send her the $2106 bill, but she went to Vimeo to avoid surprise bills. But instead she has to deal with price hikes like this, note that it isn't a bill, she can just not pay for it and cancel the service, that is the product she paid for.