You start using the service and don't pay a lot, so you make plans around a certain level of expenses. Then out of the blue you receive an "urgent" email from a sales representative and suddenly you have to go from $20 or $250 to $thousands right away.
Obviously it's not in CF's interest to keep a customer that doesn't pay enough, but dropping a "bomb" on the customer and make them feel like they're about to be kicked out from the service makes the customer lose trust on CF.
CF can probably match Fastly's price. If they had acted differently in this and other similar situations, they could keep the customer, be paid more, trust wouldn't be affected, and there would be no bad PR here.
Since the CF management that posts on HN usually say this is not supposed to happen, perhaps someone needs to sit down and look at the incentives sales reps have? Even if you don't care about the customers, this is affecting the CF brand a lot.