It's an interesting observation. SAP has opened up some of their offerings (like OpenUI5) but there's been very little buy-in. Perhaps it's also partly due to the earlier comments from then-SAP CTO Shai Agassi claiming that open source stimulates innovation? Maybe it's because the products aren't great (I'm no fan of UI5).

FWIW, I'm a massive HANA skeptic - I think it's overpriced and SAP betting the farm on it a few years ago wasn't necessarily the best option. It's a product that was put together from various disparate components - TREX, P*TIME (from Transact in Memory), etc - and that shows. It hangs together like something made of brown paper and string, with so many tuneables it puts Oracle to shame.

I have 'one' exception to that. I worked with a medical data analysis company that had implemented SAP HANA as a data warehouse/analysis platform for tons of treatment records.

My task was replacing it with Spark/S3 :P

My current workplace has implemented a custom SAP HANA-based solution for forecasting (code is written in a mixture of Python and R). I wasn't involved in the project but I'm not convinced it couldn't have been architected completely differently - perhaps a suite of microservices running on K8S with a PostgreSQL backend. Having an in-memory database licensed by RAM usage quickly gets mother-f'ing expensive as Nathan Fielder would say.