I previously posted my opinion here:
One advantage of this approach is that it give the listings some visibility from the official website while making it clearer that they’re essentially unvetted self-promotions. Also, a forum thread allows you to be more verbose, use special formatting, embed images and videos, etc. It also allows your (prospective) clients to ask questions and leave reviews and testimonials in the comments.
But I’m no longer the website maintainer, so it’s not my call. I see the merits of the arguments on both sides and have no strong opinion either way at this point.
FWIW, I do think that a healthy OS ecosystem includes independent experts offering unofficial support and consulting services to users, and I’m glad to see such offerings grow around Qubes.