I don't think relevant ads are healthy for the many people who do not have enough self-control to resist temptation. Ads are essentially playing mindgames triggering fear/jealousy on these people to steal their money. For the people who do have self-control, they don't need other people trying to tell them what to buy.

That's a good argument against bad and exploitative ads.

Not all ads are necessarily bad. Eg have you ever seen an ad for an event in your town? Maybe a play or a concert you'd want to see. Those to me feel more like "public notice: thing is happening" and every once in a while I'll actually go buy tickets. But technically, those are ads, just not the kind of exploitative ad you are talking about.

A good ad informs, while leaving the decision up to you. A bad ad distracts you with garbage and/or tries to get you to indulge in your worse impulses

Every ad on Reddit is currently from "hims" and has the message that your hair will fall out and your dick will stop working if you don't take their pills.