That, and the fact that they are giving away their knowledge and experience to anyone who wants to listen. (Plus repackaging it and selling it to anyone who want to pay for it.) Anyone who doesn't appreciate that can simply not listen to them — it's an odd request for anyone to ask people to stop publishing stuff on their own website. I for one am thankful for their free advice.

People tend to dislike the way their advice is definitive, they see a trait of arrogance in that. Me, I think of it more as being non-fuzzy, they cut through to the gist and the focal points.