Let this be a lesson to people that rationalize AWS high cost as something that won’t matter. If you have a low margin product like this, infrastructure costs can sink you. This isn’t too say they were using AWS, just that infrastructure cost is sometimes more important than development velocity.
Egress costs of AWS are straight up robbery. 0.05 per GB (assuming you use that much bandwidth, otherwise it is even higher) adds up very quickly when you have a lot of users and page clicks.