Even without SubstrateVM, Graal is a big step forward IMO in terms of interop and performance for the JVM. And Graal/Truffle are under the GPLv3, and only need

Even without SubstrateVM, Graal is a big step forward IMO in terms of interop and performance for the JVM. And Graal/Truffle are under the GPLv3, and only need JDK9 JVMCI interfaces, so I think it's mostly in the clear at this point... They can change the license, but they can't take away the code that's already open. That said: I agree it seems extremely likely at this point that Oracle is going to milk Substrate for enterprise money, and that's a shame because it is a really important component of the system, in my opinion. And not having it will be a big drag for people who are considering Truffle/Graal.