I've up-voted this and whilst I agree that it is not great if people don't share their earnings with the poster I think in the case of @Stellabelle this is really unfair criticism.

The whole point of the "secret writer" posts is anonymity without it people would not be so candid. I don't see a way for her to share the money with people without compromising this.

Also I do think the majority of these posts are done as a service to the community. I would raise your own example of @knozaki2015 - I don't think anyone doubts he is trying to help.

As for the others I will let them answer the accusations as I don't know enough about them or their posts.

I think the solution to this is an open policy about "featured authors" and how they get paid so there is transparency and no confusion. That way people can make up their own minds.