Storj DCS is a good option for storing and delivering user-generated content. It is globally availble - so you don't need to worry about AZ replication, and it

Storj DCS is a good option for storing and delivering user-generated content. It is globally availble - so you don't need to worry about AZ replication, and it's 1/10th the price of Amazon S3. We were paying $100,000 a month storing user-generated content, and now are paying about $10,000 a month after migrating