From my understanding, most European governments purchase American or other foreign-owned software, which often does not contribute to tax revenues in the countries where it is used.

Software licenses are certainly a major expense for all levels of the Danish government. (Cloud infrastructure, too, increasingly.)

They've started complaining, especially since prices have been going up, but while there's rumbling underground, we've yet to see any real movement away from Microsoft.

Actually, open-source product and code can totally be deployed or reused by private actors to make money of it

Tchap is based on Matrix and Element, https://github.com/element-hq

The open-source project Grist Core (https://github.com/gristlabs/grist-core) is developed in the United States, with contributions from some French gov tech team.

you usually don't need a collaborative product when taking note for yourself

All features aren't available in the community edition …

Do you have a reference to the differences? I can't find it on their website nor on GitHub.

https://www.getoutline.com/pricing, what missed back in the days was the multi-organization management

Actually some Outline feature aren't, which could be quite limiting when deployed in a large organization or institution

All features aren't available in the community edition …

Right, but the vast majority are – include those they are talking about.

From my understanding, all features are not open source, for example organization management aren't open-source, which limits its adoption in large institution …

It's based on https://www.blocknotejs.org/

And this again is based on prosemirror. So for better math support you would have the option of using https://benrbray.com/prosemirror-math/ .

isn't "Google Docs" the trademark https://about.google/brand-resource-center/trademark-list/ ?

That doesn't matter. It's about similarity and consumer confusion.

E.g. you can't launch an ice cream brand called "Haagen" or called "Dazs", even though the trademark is for "Haagen-Dazs".