Prohibit the advertising of content sales via the cross-server PF

[Vidu]

Regardless of the reason for the rule that doesn't change the fact they are advertising something that violates the TOS.

By that reasoning those ads are already a violation of the ToS, aka prohibited - so you can just go ahead and report them. No need to take a shot at clear-selling because you dont like it. If its actual ToS-violations you're worried about and you see them: Report those.
Why would you want to write something in the ToS to prohibite it, when its already in there?