> Pretty sure RMS would argue linux is less "open source" than emacs too.

The word you're looking for is 'free'. Free as in freedom and free software. The open source philosophy focuses on the openness of the code base and the associated advantages. Free software philosophy highlights the freedom that the software gives its user on their devices. Opening the source code is just a means to that end for the free software philosophy. Most open source software are also free software. But a few software like VSC and Chrome manages to be open while holding back the freedom from its users. Stallman and others tried to highlight this difference, but were largely neglected. The large scale ignorance of this distinction is what led to spread of travesties like the Chrome browser.

I completely agree with GP on this matter. I use centralized repos for Emacs like ELPA and MELPA like a metadata source. The actual packages are downloaded directly from their git repos. All these happen transparently and failure is practically non-existent, even in the absence of mirrors. In contrast with such convenience, the only way to fully utilize VSC extensions market is to use MS's proprietary build of VSC. If you tried installing some essential extensions (like remote editing and editor sharing) on a fork or an open source build of VSC, it would 'conveniently' tell you that it doesn't work on an alternate build and instead give you the link to download the proprietary build. Some of these functionality don't even need an extension on Emacs (eg: tramp). What are the justifications for such restrictions? They alone know. But I'm sure that they aren't technical. You're probably too busy to worry about the politics behind it, whenever you find yourself in such a situation. It's quiet manipulative in my opinion. And all these were before MS started banning VSC forks from their marketplace.

Speaking of, 4 freedoms might not be enough any more :

https://elevenfreedoms.org/