It definitly still is. We run Postgres when we host our banking / financial stuff, but when we talk with banks and say that, they demand Oracle not that 'open source amateur stuff'. We have a version of our software for Oracle (and MSSQL) as well so no biggy, but still, we always try if we know it's not a complete immediate kill (which it will be if we put it in our documentation as only option). Oracle is still everywhere at the big guys.
Oracle used to be a must-have because it was one of the few products that could handle transactions on a scale of a bank, with all the requirements for backups, redundancy, etc.
A fun anecdote. Back in 2000, I was present at negotiations (as a note-taker) where database vendors were bidding for a project for a factory control system. Vendors submitted benchmark results for various DB sizes up to 40Gb, and Oracle's rep hautingly said something like: "Our minimal size for benchmarks is 80Gb, so here are our results for that size".
And this was a _lot_ for that time. Now? It's so ridiculously tiny that you can host it on a smartwatch. So why would you pay Oracle?
Our Oracle license licensing went up so dramatically that the team I work with is moving some very large databases to postgres from Oracle because it doesn’t make financial sense anymore.
now, if we could only stop eating at the trough of Broadcom…
Postgres ftw. Long may it eat their lunch.