And this can happen on HackerNews too! Here is a thread in the last week where 50% of posters from HackerNews were berating Microsoft for open sourcing all of VS code, but not open sourcing one of their free language servers (calling them selfish, anti open-source e.t.c.). I think this is the exact same sentiment.

https://news.ycombinator.com/item?id=25719045

So Microsoft open sourced all of VS Code, but didn't want to open source the Pylance language server (a separate product which is installed separately as an extension) which they provide as a free (as in beer). This is because Pylance is also used within their other (charged) offerings such as full Visual Studio and is a differentiator from their competition in the premium space. Also they have hinted that it includes some proprietary secret-sauce that they don't want to make public.

Bear in mind that Microsoft is making VS Code free and open source... here are some quotes from the thread:

> I find it what they are doing to be dishonest [...] the consequences of their actions is that people who dislike them will talk bad about them.

> [Microsoft] have the right to be two-faced about their open source policy, I have the right to speak about how I think it's bad to do so.

> They should please stop acting like they are the second coming of christ for open source [...] they are misleading their users.

> Microsoft proved that they only care for OSS [...] because it enables them to spy on coders and their code to develop proprietary and closed sourced spins for software development product. The OSS community got served.

> Microsoft always does this, they fool people by pretending they’re in favor of open source or make something free but it’s just a trick used to bait and switch people into the proprietary anticompetitive Microsoft ecosystem.

> Seems like Microsoft is back to pissing in the public pool.