I imagine, to a certain extent a willingness to bid highest for an ad display is itself a pretty good sign of relevance. I can imagine alternatives though, lik

I imagine, to a certain extent a willingness to bid highest for an ad display is itself a pretty good sign of relevance. I can imagine alternatives though, like a real time auction to donate the most to charity and the platform maybe gets a set fee or a %. This would still generate a useful signal but remove some of the current negative incentives.