We should assume that all ads in general are scams. The noise to signal ratio is too large to care. Word of mouth and maybe trusted communities like HN is the only way to reliably discover new things.
Generally if all the ads you see are scammy, it means you probably are using some form of tracking/privacy protection. When an ad network has a strong profile on you, legitimate companies pay good money for those ad slots. When they don't really know who you are, only bottom feeders bid on the ad slots you see. In a way, it almost acts as retribution for not submitting to the anti-privacy machine.
But no. I could argue that hypothetically scammers would know exactly what I would fall for, but I have real evidence: Facebook knows everything about me and serves me mostly scams, since ever. My Google ads (mostly in Youtube) actually became less scammy when I opted out of all targeting that I could find (went from crypto scams and 5G protection to car commercials and big brands reminding me they exist).