If nothing else, an ad cannot impartially compare a product with the competition (and sometimes the "competition" is buying nothing at all), therefore every ad lies.

If I already needed or knew about it, I didn't need the ad.

If I was happy with my life without the product advertised, I didn't need the ad.

Furthermore, ads are fueling our capitalist, consumerist economy that is destroying the planet. Ads are a literal existential threat to humans.