I know that you need paid advertising onsite. If not, we would all have to have paid subscriptions. But of late thare has been some really tacky advertising, including extremely specious diet sites. I won't name names, but they advocate unhealthly fad dieting, including chemical-laden "food", not sensible eating. Idem a certain fitness site that seems to cater to 20-year-old women only.
I'm certainly not opposed to advertising links, but these should be vetted so as not to insult your site users.