Nobody cares there's only one implementation that's really used widely for Java. I don't see why I should care what VM is used for the web. Chromium can be that and you can build whatever tooling on top to interact with that VM
I think this argument would have credibility if it wasn't for the fact that Google is ostensibly waging a war against the ability to extend the browser in any way that harms their ads business (with Manifest v3).
Google has a massive conflict of interest with the free and independent web in a way that Oracle does not have with the ability to build and run arbitrary Java applications.