https://open-vsx.org is used as VSCodium's default extension gallery, but currently the target platforms it allowing extensions to specify is not as much as platforms VSCodium supports. I would suggest adding more allowed target platforms (e.g. loong64, riscv64, ppc64le, s390x) so developers would be able to publish platform-specific extensions targeting those platforms, and users using VSCodium on those platform are able to search and install platform-specific extensions directly.

Note that although Open VSX uses vsce for extension packaging now and it doesn't support those platforms, it's easy to build vsix files targeting new platforms by patching vsce (one line) or modifying the extension.vsixmanifest in vsix files.

I've tried to add loong64 as a new target to openvsx and commited PR-ready changes here, but I think more discussions ahead might be prudent.

Related discussion: VSCodium/vscodium#2521