The main effect of that button is blocking the measurement of whether your ad click turned into a purchase, which is important because pricing ads based on conversions is more efficient than charging for impressions or clicks.
“Relevant” ads are sort of a red herring. Ad personalization matters, but commercially it’s less important than conversion measurement. Notably, Apple asks for permission before showing personalized ads, but never asks for permission to track conversions (while blocking competitors from tracking conversions by default).
Less targeted ads are less likely to psychologically manipulate me in to spending money. I'd like an option to only show me ads I have no chance of spending money for.
It speaks to how good targeted adtech is. When I don't give them unlimited access to my metadata, the ad quality plummets. They really can give you "good" ads if you let them. But now they have to waste money on untargeted ads for me lmao.
> objectively this means you still get ads just less releavnt ones, no?
business might choose to not show ads at all vs showing irrlevent ads. Surely there is a downside and risk to showing ads, a risk that cannot be taken willy nilly.