How many database companies are out there that made it big? How many are based on FOSS? It seems like the lesson of “you can’t make money in a FOSS database (or file system)” keeps being learned and relearned the hard way.
MongoDB would be one that comes to mind which is public traded ( https://finance.yahoo.com/quote/MDB/ )
- MongoDB
- Snowflake
- Databricks
These 3 are probably the biggest, but there are few others which are promising: Cockroach Labs, Materialize, PlanetScale, Yugabyte.