- Do ad-techs have a perverse incentive to do a poor job of it to drive up ad spend artificially? "Dyspersonalizing" of ads?
- Would this even be obvious to companies?
- Have advertisers insulated themselves, or managed the risk of adversarial dulling of ad effectiveness by tech companies?
[0] https://www.bloomberg.com/news/articles/2021-10-22/snap-warning-feeds-concerns-over-social-media-ad-splurge
A lot of ad-spending is waste, and it's one of the easiest cuts to make when facing a downturn.
I'm not sure what point you are trying to make vis-a-vis personalization. Personalization is not actually a huge driver of ad effectiveness - but targeting is.