The point of a Show HN is for the author to get feedback on their project. It is not an opportunity to sell/recommend a competing product/tool. I am starting to see this anti-pattern a lot in Show HNs, please stop!
Also pointing out competitors might be some of the best advice one could give IMO.
Sometimes 1-liners like "Checkout xyz, been around since 2014" seem a little like an ad leaching off of the original Show HN.
I think it depends strongly on the content and the framing of comment.