ok sure. Why not.
> and increase brand awareness […]
Hm. HN isn't Google. Brand awareness isn't always positive. There are several examples here where repeated coverage causes knee jerk negative reactions.
> SEO
Yes, that is a problem. If every time someone posts about grammarly or whatnot, if the Google algorithm doesn't care that people are vomiting with disgust in the comments, and treats that as "engagement", that is a problem.
Then again, you run the risk of having a page full of "omg grammarly is so shit" comments at the top of your Google ranking, so maybe that's appropriately Darwinian in a sense.
(No hate on grammarly, I just couldn't think of something more HN specific right now)