https://aws.amazon.com/cloudfront/pricing/ says that the $15-per-month plan comes with 50TB of "data transfer"

Does "data transfer" not mean CDN bandwidth here? Otherwise, that price seems two orders of magnitude less than I would expect

With AWS, there's always a catch. In this case, it's for 10M requests. In other words, you pay $15 for 10M requests of up to 5MB each.

[edit: looks like there's no overages but they may force you to flip to the next tier and seems like they will throttle you https://docs.aws.amazon.com/AmazonCloudFront/latest/Develope....]

The $15 plan notably does not come with DDoS protection though.