> I don't think that's ever saved money.

I spent about a year as a consultant in the AWS space, visited about ~15 clients of varying sizes.

More often than not there's a single pg aurora instance responsible for 50%+ of the bill. Even worse are the serverless aurora offenders.

All the indexes and guarantees of PG don't come cheaply and dynamodb pricing is not cheap but comparatively reasonable. It really is a good product if you know how to use it.