But you are buying into viewing ads when you use services that show you ads.

Also, ad bazaars sound great until you realize that every locality needs to have their own bazaar. Seeing ads for New York barbers is kind of useless when you're in Los Angeles. Now you have a million ad bazaars and that's the only advertisement allowed. A little bit of corruption and your ads outshine all your competitors in that locality and they go out of business, since signs are an ad too.

Also also non-personalized ads mean that the only things that can be advertised online are digital goods or things that are available globally. Basically, it will work for Amazon and AliExpress but that's about it. And adsls in Russian or Japanese or Korean or German or French or Swedish or Portuguese aren't going to be that useful for you, are they? Ads in English but for a product in another country might be even worse.