SAP has largely switched over to their own HANA database for new deployments. Even before that their "AnyDB" database worked with pretty much any backend and is still supported. The reason you see oracle has less to do with what SAP wants and more to do with "It's what the company/engineers have already used/set up in the past".

Regarding Java, SAP has long switched over to openjdk (though oracle java is supported in some cases). Specifically, they have their own custom fork of openjdk "SapMachine" precisely to be independent from oracle (FYI: if you look at openjdk upstream you will see many core contributors are employed by SAP)

In general, I would say that the actual tech companies that have to interact with oracle's stuff are generally very well equipped to drop them or have already done so. The bigger issue are legacy "consumers" of oracle (e.g. if Pepsi has their data in oracle DB), which often do not have such contingencies.