https://www.macrumors.com/2018/01/09/ad-firms-hit-hard-by-safari-tracking-prevention/
https://en.wikipedia.org/wiki/Usage_share_of_web_browsers

- Internet advertising groups complain that Safari's cross-site tracking blockers "could have a 22 percent net negative impact on its 2018 revenue projections."
- Safari has held a steady 13-15% usage share for a couple years now.

This implies either that Apple users represent a disproportionately distinct marketing demographic or that certain marketing associations are blowing smoke.