Exactly this.

For me, the C/C++ language pack stopped working overnight with Cursor. This was clearly because of commercial concerns about derivative IDEs fairly and squarely gaining traction over the original product. But it broke my workflow a couple hours before a meeting.

I use neovim with LSPs and this is unimaginable in my world. I have started using IDEs only because the productivity gains from better LLM integration are undeniable. Sure I moved to clangd in Cursor and it was all fine, but the IDE actively pushes you to install Microsoft extensions, that can be yanked off whenever some Msft PM decides "oh we didn't actually want our competitors to be making money".

LLVM/GCC/Neovim/Apache projects are open-source. Anything that is "open-source until it is not" is not open source, and this perfectly describes VSCode today.