You must realize that what you're saying is an argument for better targeted ads. If you don't, I don't know how to help you see it.

Better targeted ads for some truly unequivocally beneficial things like scholarships might be a good thing, all else being equal. But:

1. Targeted ads requires enormous machineries of surveillance and file-keeping. Having too much information in closely related form is akin to having too much uranium in close proximity; it causes problems all of its own almost just by merely existing.

2. Ads in general, even the beneficial ones are, by definition, distracting from whatever content we were trying to read. See: São Paulo’s “Cidade Limpa”.