The vast majority[1] of people do opt out as we can see with the "ask app not to track" on iOS. When it's a simple yes or no button, nobody wants to be tracked.

It's pretty funny seeing youtube beg for you to allow them to on a screen right before the popup. Of course, I doubt they haven't found a way around it at this point.

[1] 96% in 2021

https://mashable.com/article/ios-14-5-users-opt-out-of-ad-tr...