> People will send you stuff to rack up your bill Sure, but on a personal level, that's still very, very cheap, almost without concern for how much you follow.

> People will send you stuff to rack up your bill Sure, but on a personal level, that's still very, very cheap, almost without concern for how much you follow. CloudFront and API Gateway are pennies per million requests. SQS usage would probably fit in the free tier. DynamoDB, if implemented with a single-table design, would probably cost no more than a couple of bucks, and storage would probably fit in the free tier. You can use IAM policy on pre-signed URLs to restrict the maximum object size of an object that someone is sending you, as well as implement effective rate limiting and automatic expiration with lifecycle policies that keep costs under control. Of course, costs could expand if the user wants to keep an infinite history, but that's their choice, by design.