Fancy would be writing an application to talk to RDS, creating an RDS instance, creating a database, creating whatever IAM link is needed for auth into the db so you don't need a second set of credentials, creating a schema, creating columns with different data types, and then modifying the application to handle edge cases for the different data types, logic to insert, update, delete rows, select items, yadda yadda yadda.

Dumb is `aws s3 cp` and being done in 5 minutes.

I'm only wildly guessing here, but most likely the "cloud storage" backing all those managed databases is actually S3-like blob storage under the hood.