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It is absolutely fine. I would not be surprised if it wasn't fairly common, in fact. Note that we frown on creators adding Audience Reactions items about their work, however.
"For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled." - Richard Feynman
One thing to keep in mind: you don't get creative control over the works page. The Fic May Be Yours, but the Trope Page Is Ours.
Migrated to Chloe Jessica!
Objective tropes that anyone can verify? Go for it.
YMMV tropes? Only if you're moving them from main to YMMV or correcting spelling grammar.
Coming back to where you started is not the same as never leaving. -Terry Pratchett
YMMV tropes (as in, all YMMV things not on Audience Reactions) are problematic. They tend to involve a degree of audience response but don't qualify as Audience Reactions because they have in-story elements. Because of this, there is a bit more merit to authors adding them but it's to be done with care.
"For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled." - Richard Feynman
Is it ethical/accepted to add content related to a video game made by me? Obviously I wouldn't make an advertisement, but I still feel it might be frowned upon.
So... what's the policy?