As in the case of most (if not all) professional bankers, consultants and lawyers, PR social settings (be it dinners, charities, drinks, galas, sport events or alike) operate in a manner that is so different than a social forum like this. Clients are carefully curated and certain ettiquette is expected from all of the attendees (hosts and invitees). This forum however operates in a completely different manner. Ppl who are active in this forum arent necessarily the target market of many providers, vice versa. It wouldnt surprise me if such providers (who have a different target market) are unwilling to subject himself to uncessary drama that many posters here seems to enjoy.
As a client, I first filter potential hire based on his physical attributes, only then based on reviews (of his performances and his likeness as compared to pictures posted on his ads) from others. I am unlikely to hire simply based on his posts or opinions posted here. That said, I reckon providers might wonder whether active participation here would bear an attractive ROI, or perhaps their times are better spent on other mean of advertisements with proven track record e.g. OF, IG or alike.