Ni! Hy everyone and thank you for your response! 
I agree with Jenny (@jcm80): CC-BY-4.0 is very likely the best option. NC is non-free, so it’s a no-brainer, but we also don’t benefit from SA in this context - it may actually hinder some uses (like the one I mentioned where some forum content might be useful in the documentation of a project, or even blogs that would like to republish a post.)
So for now we have:
- Change license to CC-BY-4.0
- Remove paragraphs about paid services, advertisement, service upgrades.
- Replace placeholders with the given values.
However, upon a closer look, It seems we’re using an old TOS tamplate that has since been replaced by Discourse. The new template is very different and can be seen in the Discourse repo or on their own forum.
It seems the new TOS is longer, more generic and more specific on points about “liability and dispute resolution”. For one, the way it is written, in my view, requires us to explicitly name the company running the forum. It also does not have any of the points we don’t require. And it doesn’t mention a license, so we’d have to add that section.
Its placeholders are:
- base_url
- company_name
- contact_email
- info@openhardware.science
- governing_law
- [I don’t know, probably country where company is seated?]
- city_for_disputes
- [I don’t know, probably city where company is seated?]
I’m fine with migrating to this new TOS, but I’m also fine if the overall opinion is to base our TOS on the current TOS.