Eclipse foundation has a new project, Theia[1], which forks VSCode and one of the reasons they state is that the extension ecosystem is not opensource.
They want Theia to be a tool to build your own editor and it can be built as a hosted solution (like code-server) or a standalone editor
Edit: I see that the article also mentions Theia but this point about Theia vs VSCode is not mentioned.
They want Theia to be a tool to build your own editor and it can be built as a hosted solution (like code-server) or a standalone editor
Edit: I see that the article also mentions Theia but this point about Theia vs VSCode is not mentioned.
[1]: https://theia-ide.org/