alt Hacker NewsDefinitely true, but a lot of Oracle sites are that way because of decisions made decades ago. Opportunities to re-architect are rare. But when those opportunities do come along, nobody is choosing Oracle RDBMS for their future state.
What I do see is orgs choosing other Oracle apps like ERP which sneak the Oracle RDBMS in as part of the bundle.
Anyone using Oracle purely as a database is going to migrate to PostgreSQL eventually, but there are a lot of orgs where the database is just one part of a wider Oracle ecosystem with world-class vendor lock-in features.
They have some funny accounting like Google and Microsoft where everything is "cloud" but the revenue streams are certainly diversified from straight Oracle DB such that PostgreSQL equivalence or superiority does not affect the viability of the company or the stock price. Communities like this often over index technical and personal opinion with reality.
I worked at a midsize that was core internet infra, where we had an in house OS and ODM hardware and FOSS DBAs. The one Oracle DB and Oracle HW was slipped in the door through finance for ERP as you say. Although I suspect that would be cloud hosted these days.