Hmm. I found this article informative. I suppose it did mention their service, but only toward the end. Even then, it wasn’t like “Buy now for 50% off!!!” So on balance, I am glad they posted.
I am not any way affiliated with the company and I did the submission. I do believe that informative blog posts by industry insider should be allowed and it is not bad practice to promote your company. Especially on HackerNews where it is relevant for audience (no conflict of interest with YCombinator funded companies?).
Otherwise any SaaS ecosystem could become AWS/Google/Microsoft well known names only. Rules should be also equally applied. E.g. Each GitHub blog post promotes GitHub and thus Microsoft.
