I think you can find exceptions in any discussion, but that's not exactly helpful.

Here's the thing: If I don't answer the user's query accurately, another website will. Then they will get all the traffic. So my long term incentive is to satisfy the query.

Within that there is a certain tolerance and understanding among search users that websites can't publish information for free. See Wikipedia constantly begging for money.

So companies (my clients) can justifiably get away with a small amount of self promotion. But if you take that too far you'll just get punished in the SERPs too.