They have a couple of open source products.

However they are not one of the big 4 as you have listed.

I have heard MS employees talk about open sourcing some of their bigger products and the conversation always comes down to the issue of the third party code (libraries, etc) they use that cannot be open sourced along with the main product.

I'm not defending Microsoft in any way just giving an explanation I have heard over the last few years. I believe Mark Russinovich has talked about open sourcing things a number of times if you want to look into it further.

Visual studio code is open source. So is the new windows terminal.

Yes. And not the “eh” open source MS-PL, but actual MIT.

I was talking about "visual studio", not "visual studio code".

If visual studio code is open source, please show me code of Remote Dev extension.

Goalpost moving.

Wait, what kind of logic is that?

Why does an extension need to be open source for a program to be called open source?

If someone writes a closed source plugin for LibreOffice or GIMP, does that mean they aren't open source?

https://github.com/microsoft/vscode-remote-release ?

No code there

What (large) companies have open-sourced their core product? I don't think anyone is accusing Shopify, Facebook, Google, etc of being anti-open source.

Gitlab

Gitlab core offering is gitlab enterprise that is not fully open source.

They do have gitlab ce that has just a subset of the functionalities from Gitlab Enterprise that is open sourced.

FYI, https://about.gitlab.com/install/ce-or-ee/

that page is PR lingo telling exactly the same thing i said..

the first line even say: in doubt use gitlab ee

the point here is that core has two distinct meaning in the op question in gitlab pr..

Gitlab ee is their core product, core here meaning their main product..

the fact that the core of that product, here meaning the base the product is built upon, was released as open source does not make the whole product open source..

So, gitlab core\main product is not open source.. But the core\base of that product is..

IBM, sun microsystems.

Likewise for Google. Until that search engine is open source, it's like they've done nothing for open source. /s

Not a Googler, but an OSS dev. Google is different in that a) the Googlers inside OSS projects generally behave and are not power hungry and b) Google has started and open sourced large projects like Chromium or Go.

Microsoft tries to aggressively buy its way into existing mature projects.

So where can I download the code for Google’s search engine? The backend code for Docs/Sheets? Google Play Services?