The OP states he wanted it to scale and cost-wise using AWS on-demand resources is much cheaper than running multiple EC2 instances which are over-provisioned to begin with. AWS functions and EventBridge is the same thing as CRON and a monolith. LOL why waste a full VM when you could pay pennies on the same system. Obviously vendor lock-in a bit, but who cares! lol ridiculous.

[EDIT]: Removed comment about user.