It's 3. Our intention is to only monetize DbaaS revenue and opensource all/most of the tech with Apache 2.0 license. It's similar to that of Databricks. Databricks over time built out photon that is proprietary. We will stay away from this ideally forever. Enduring technologies are fully open source, we see an opportunity to build a standard scalable storage tier for Postgres and maybe for other engines over time (other engines are off strategy right now).
Tips for transitioning to database development: learn rust, start working on systems, ideally get a systems job, and optimize for being prolific. Write a lot of code
Please do apply! we are hiring around the globe!