https://arstechnica.com/gadgets/2021/05/96-of-us-users-opt-out-of-app-tracking-in-ios-14-5-analytics-find/

It seems that in the United States, at least, app developers and advertisers who rely on targeted mobile advertising for revenue are seeing their worst fears realized: Analytics data published this week suggests that US users choose to opt out of tracking 96 percent of the time in the wake of iOS 14.5.