Hacker News Reader

"Available at a fraction of the cost of legacy databases, with a free developer edition"

So I guess there is some kind of licensing model even though you can download it and run it on your own servers.

Yes, perhaps there is a free developer edition, but for commercial deployment you have to use their cloud. That'd be a bummer..

Disclaimer: I work on Google Cloud

Yes it’s commercial but you can run it on any cloud or on prem.