But does anyone like being involved with Oracle? There are other java vendors that offer support.

Probably not for the most of the tech companies nowadays, but there are still large companies who still uses Oracle products, so they might pay Oracle Java support as a package deal most likely.

I think it'll be very atypical for a companies who doesn't use any of the Oracle product to use proprietary Oracle Java and pay for the support

There are, but Oracle employ the vast bulk of the JVM and standard library experts in the world so they are in a position to offer far better support.