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Kinda harsh to see it that way. You could remove the last four 4 sentences of the post and don't see it as an ad at all. The post does actually explain the most important part and the guy just tells us we can hire him if we need help.

What information exactly are you missing? The post lists why developers do it, why it’s bad, and what you can do instead - as promised.

I don't think we should have an "ad" tag. Most "show hn" posts are basically ads for new products, and still very useful and very welcome. If you think a submission is inappropriate or dishonest, you can flag it and write your reasons in comments.

It for sure makes you aware of a problem; I personally never thought about it, I imagine many other people didn't either