For comparison, note also that ElephantSQL offers 20MB databases on their free tier with 5 concurrent connections. They charge about $20/mo for the tier that Fly is offering here for free.
I was not aware of the other portions of the free compute tier from Fly.io, was looking into Oracle Cloud. (Ask HN: What cool stuff do you run free-tier? Sep 2021https://news.ycombinator.com/item?id=28652736)
https://www.cockroachlabs.com/pricing - 5GB, 250M "request units"/month (distributed, PostgreSQL-ish https://www.cockroachlabs.com/docs/stable/postgresql-compati...)
I was not aware of the other portions of the free compute tier from Fly.io, was looking into Oracle Cloud. (Ask HN: What cool stuff do you run free-tier? Sep 2021 https://news.ycombinator.com/item?id=28652736)