You're conflating LSP and VSCode. LSP is a completely open spec for things like autocomplete, syntax highlighting, symbol searching and so on. Any editor can use any LSP server and jetbrains is using it for new languages in their editors and fleet
VSCode is also completely open source. The only thing not "open" about it is the keys they use to make the final distributable. Even the VSCodium docs say as much. They literally just build the final distribution but with slightly different keys to point to their open source extension distribution website instead of the Microsoft one
VSCode is also completely open source. The only thing not "open" about it is the keys they use to make the final distributable. Even the VSCodium docs say as much. They literally just build the final distribution but with slightly different keys to point to their open source extension distribution website instead of the Microsoft one