I'd just say all advertising. It's effectively money time and effort we just light on fire.
It's easy to agree with all advertising. I think that's the quickest, easiest measure to cut that yields an outcome beneficial to society, and that more ads are nearly always worse.
I also think that sales are worse for society than every day prices that deliver value; sales do make sense for things like seasonal items which are in abundance due to just being harvested.
Instead, we're forced to turn to third-party testers with dubious manufacturer relations - even when the results aren't freely available! - or technical knowledge (e.g. Consumer Reports using 1/3 octave smoothed power response for loudspeakers)...