When the early adopters start pushing neural implants they'll be ad-free. Not long after your boss insists that everybody needs neural implants for the sake of productivity, they'll be ad-supported but moneyed developers will be able to opt out. The terms of the ad-free service will continue shifting, so nothing is ever really ad-free for long, and ads for better neural implants are promotions not ads right? But y'al…
I think this was the plot of a Black Mirror episode?
It's the plot of many a dystopian scifi story.