Much like the star bellied sneetches, when the quality of some ad format becomes untethered from the cost of production and placement, then marketers will flock to some alternative.
YouTube influencers fill[ed] that niche for a while because content milling SEO spam and fake reviews is a lot more expensive if you present the results in video form with good production values. (Not sure how long that will be true, since AI is getting better at short-term video).