Here's the second draft of the addition that I proposed. It's longer than any other section on the page other than "We are not a revenge or troll site opposing TV Tropes" and "We are not officially affiliated with the Wikimedia Foundation"; perhaps it could be trimmed a bit.
We are not a "reception wiki"
According to the definition used by Miraheze, a "reception wiki" exists to let people post about works that they really like or dislike (usually one or the other, depending on the particular wiki). While we do have Audience Reactions pages (YMMV, Funny, Heartwarming, Awesome, Tear Jerker, and others), they are not the focus of this wiki, and contentious pages of any sort are monitored more closely than other pages are.
Writing well-thought-out and grammatically-coherent pages in the Analysis and Reviews sections, as small as they are, is much preferred here to simply posting bullet-point lists about what people like or dislike about a work.
While our readers and Tropers can choose to read contentious pages such as Gushing About Shows You Like and So Bad It's Horrible, the majority of Tropers don't, choosing to focus on troping instead.
We have also had core policies in place here without change since we founded the wiki. One of those core policies is tolerance for others: "You may not agree with an editor, but you should always be able to respect another editor." Doxxing and edit wars are frowned upon here; if you aren't willing to at least pretend to be tolerant, you probably won't be comfortable at All The Tropes.
And here's a draft of the change that @Looney Toons suggested, adding in an edge case that should be mentioned EDIT and with a link to our wiki host:
We are not soapbox/advertisement space
(two paragraphs snipped because they are not changed)
We also do not permit advertising of any sort, including spam, either by bot or by a human editor. It will be removed with prejudice and the poster permanently banned without warning. (Our wiki host occasionally holds fundraisers, which do not fall under this prohibition.)
These are still draft proposals - feel free to continue making suggestions about them.