[winteriscoming]

Don't know about "most" OpenJDK devs, but Red Hat is heavily invested in OpenJDK and has an entire team of employees working in it.

[pjmlp]

Yet they aren't the ones putting money on Hotspot, Graal, G1, AOT compilation, SubstrateVM, JNI replacement, ....

The only core VM technology has been Shenandoah GC (which isn't production ready yet)and the Zero Assembly port.

Most of the Red Hat money goes on Java frameworks like JBoss or RichFaces (now dead).