That's a bit of hyperbole, because it requires a company to sacrifice developer good will (if it has any, unlike Oracle) to claim ownership/copying.
Also, where they reasonably can, people need to stop building on tech owned by companies they despise. Of course this is not reasonable in many cases, but for me, I won't use Graal and will actively tell others not to because it's easy not to. I don't have a problem w/ Google or FB like many others on here, but if you did, not using Go or React is probably unreasonable, but not using Google Cloud might be reasonable.
Also, we need to start holding privileged developers accountable for their chosen employer. I'm not talking about the underprivileged intern, I'm talking about the Oracle engineer that continues to work there at this time. If it's on your resume of late, I won't hire you. I also might not accept your PR if you are employed there.