The problem with ads isn't "good" or "bad" ads, it's that the nature of building a business of serving ads inevitably leads to an unquenchable thirst for data plus customers whose primary goal in paying you is to sell things, not to provide value (though some may do so as a selling strategy). It's hard to imagine how, or even why, such an ad business could serve the best interests of the end consumer, despite the idea held at one point that perhaps consumers would be so turned off by ads that they'd defect to a different solution. There might be SOME people who don't use Google or Facebook for these reasons, but most people simply deal with poor user experience, security, and frustration because they want to see things listed with reviews on a map, or know what their friends are doing on the weekend.