Eclipse Oniro is an interesting proposal to build on top of OpenHarmony. Kind of "Palm/HP webOS and Firefox OS were right conceptually, but too early", minus Linux kernel and middleware.
Just checked it out. The site looks cool but I doubt OpenHarmony or Oniro will go anywhere. I just have a sense that it only exists to lend credibility to HarmonyOS outside of Huawei/China. Reminds me of MeeGo.
Around 100 million using OpenHarmony already in China in the last nearly 5 years of its existence. It is already going everywhere. Watches, phones to computers as well outside Huawei HarmonyOS https://github.com/openharmony-research/