AWS now offers Aurora Serverless  a new version of its MySQL compatible database that scales up or down on-demand or automatically based on load. It is very cost-effective with per-second billing and ideal for intermittent, unpredictable workloads.
The significance of this cannot be overstated. Scaling databases used to be a lengthy project of many months, if not years, carried out by highly technical introverts or DBA (database administrators). Amazon just automated away this tedious, expensive task, saving the customer money while improving operational readiness. Although AWS is not the first to do this – the Cloud Data Warehouse Snowflake  comes to mind – it leaves little reason for not using the AWS RDS service for everyday database needs in this day and age.