Pylance/Pyright are proprietary and don't even work on open source builds of VScode (theyre hardcoded to work only on MS builds of VSCode), let alone any other IDE.
From what I can tell, Pylance is proprietary and intended to "extend/extinguish" the open-source VSCode codebase with Microsoft's proprietary VSCode binaries, but Pyright is open-source.
Hmm, I hadn't checked the license. Pylance is indeed proprietary.
Pyright is open source (MIT)
Pyright works well for me in vim-coc. Of course ymmv