"Alessandro was a Sr. Software Engineer at Bloomberg, LP where he worked on high throughput distributed pricing systems. He holds a Computer Science and a Biomedical Engineering degree from Johns Hopkins University."
Looks like they've built stuff before.
I don't like this database product because it lacks SDK:s in languages I would touch without getting paid, but I think the idea is sound and rather attractive. For many years I've used Picolisp in a similar way, it bundles an object database with a logic engine and a small Lisp-like programming language, which makes it easy to throw in some data and relations and slap on a web page with standard library widgets.
The BEAM is similar, you push some modules into it and store stuff in ETS and don't bother with RDBMS until you need it. If your data is small or trivially shardable you can get persistence too, with Mnesia.
I'm not so sure they'll be making a lot from that game of theirs, but if their database turns out to be robust it could become competitive with things like Supabase/Firebase and such, because there will be modules for serving web and auth and dashboards and whatnot you can just push in there and you're good to go. One-click-install for applications, similar to cPanel and Wordpress rigs, but less messy on the ops side.