I think they didn’t want to rewrite their post. It’s more substantial and researched than any comment here, and all their posts are full of information. I think they should get a pass, and calling it self-promotion is a stretch.

Because I want people to read it. I only promote it if I think it's useful and relevant.

You're good. Disregard the haters.

I think you need to realize your fans don't have the same intent as you. You should ask your audience what they want you may be surprised.