So the answer to preventing scam ads is only allowing the richest companies have a chance to advertise?

Surely there’s a better way.

I worked at a local TV station a while back, and I programmed the commercials. You would be surprised at how little those slots go for. Off prime time, a 15 or 30 second add spot might sell for a couple dollars. At night they’re only a few cents. It was a mid-sized metropolitan area, so I don’t think this would be so out of the ordinary.

To this day, I have no idea how any TV stations are financially solvent.

Well, higher prices not only allow for people to be paid decent money to review the ads manually but are also a bigger risk for any scam operation as not only is it more difficult to obtain & move that amount fraudulently (you're not going to be able to buy a TV ad with a stolen credit card) but they also have much more to lose should their entire operation be discovered (presumably, a TV network discovering a fraudulent attempt will report it to the relevant authorities and will not just give the money back).

NordVPN's ads have made it onto TV, and a lot of TV ads nowadays are for gambling. Nevertheless it certainly is easier to regulate advertising if it isn't dynamic.