Banning things tends to lead to the market routing around the ban, via black / grey markets. In the case of ads is hard for there to be a true black market, because ultimately the ad needs to reach a users pupils. But I suspect if you outright banned ads you'd get a lot of grey area, such as promoted posts, affiliate messages, influencers. Things that blur the line between ads and content. Instead I'd prefer a high excise tax on advertising transactions, similar to how we tax cigarettes. That way it doesn't ban advertising outright, but it does change the cost analysis on it, and it becomes a source of revenue for the state that (in theory) everyone can benefit from.