Just want to ask that the rule be clarified as it seems to currently only be for keeping you from soliciting for someone else or posting in bad faith, while the rule itself sounds like a blanket ban on talking about others and their lions in the community.

Do not post content or links relating to other user's accounts, sales, raffles, lions etc.
The header of the rule and the most vague. I propose it should read "Do not use content or links relating to other user's accounts, sales, raffles, lions etc. for your own gain."

Do not solicit other users to advertise on your behalf.
This is fine. Might even want to be its own rule for further emphasis.

This excludes linking specific lions or threads for solely informative reasons, for example to share a game guide or a new mutated lion that was born. Excessive linking of the same topic will be considered advertising.
This needs to be immediately apparent in the rule header, not a somewhat vague exclusivity.

This excludes clan owners using their clan thread to advertise clan members' raffles etc at the member's request.
This is fine.

This excludes "stud collaboration" threads where every stud listed in the compilation has a corresponding entry in the thread itself from the owner of the stud
This is fine.