At least if cost and scaling to zero is important to you. Dynamodb addresses the cost issue, but it's so painful to use, and is unsuitable for a lot of use-cases. Aurora Serverless takes 30 seconds to cold-start, so it's also usually a non-starter, other than for batch type workloads.
So great work, but I have a couple of questions:
Any plans to support AWS privatelink? I played around with this a bit, and it seems you need to connect to it over the internet which isn't always ideal.
Will there be a limit on how many free databases you can create? I think there are some valid use-cases where one might want to create a bunch of them, but I would be scared to do this at the risk of being kicked off your platform for abuse.