[pkkm]

Why is it a problem that LSP was originally invented by Microsoft? It's an open protocol with many free-software implementations. You don't have to use any Microsoft code if you don't want to.

Besides, even if that wasn't the case, Emacs has long had a policy of interoperating with non-free software. It runs on versions of Windows from 98 to 11. That's not because its developers don't value free software, but because they realize that this is a more effective way of convincing people to use free software than insisting on absolute purity.