>Not do that and not have to maintain that? Just a regular AWS instance with SQLite will be far easier to setup, with regular filesystem backup which is easier to manage and restore.

You'd have less maintenance using RDS than you would with an SQLite hosted on a VM.

>The issue is assuming that "scaling to millions" is a design goal from the start.

I was responding to the OP who said you can scale to "millions of revenue" on SQLite. This part is true. You could. But it'd be easier to do it on a managed Postgres instance.