Not that I can really follow with the mentioned logic and why there even is no opt-in or other way just to browse through some random material to get some impression and ideas what to follow, but my question is answered - thanks !
I’d suggest that this information should be available (at least as a reference) on social.librem.one e.g. behind the link About this server .
The referenced documentation says:
Understanding a website’s policies
And also in docs.puri.sm there is no reference to this information - even though there is a screen shot of the starting tutorial showing the difference between the three timelines.