Are there more compelling use-cases than creating public-good kind of whitelists? What incentives encourage sharing of websites? I can list some undesirable inc

Are there more compelling use-cases than creating public-good kind of whitelists? What incentives encourage sharing of websites? I can list some undesirable incentives: marketing, "shilling" products, MLM promotions. Don't get me wrong, i'm not a cynic, rather, i'm trying to play the part of devil's advocate here. Overall, i'm excited about the idea as I'm quite certain that altruism will prevail and the community will develop well curated website recommendations that make navigating the web a better experience.