I don’t know it well, but appears the value prop is more “we’ll replace your cloud hosting provider” rather than just being a database. As such, I wouldn’t expect BEAM projects to be in their audience.
That being said, Elixir would be a great choice to build a similar platform.
Strictly as a database, it’s a tough sell for me to be honest. There is no concurrency (in the transactional sense of the word) and migration support looks light.
I watched a talk about it when they first announced Bitcraft, and the very first thing I thought was: Is this built with Elixir/Erlang? It turns out it wasn’t, but the idea is still super cool.
I’ve played around with ECS a bit, and it’s super fun; it’s a shame we don’t use more outside of games. TBH, I had almost forgotten about it, but this video made me reconsider taking a stab at it in the future for some projects where I was planning to use Elixir (will help reduce the boilerplate and make it more AI-friendly - fewer moving pieces equals fewer problems).