So what? You can opt-in to tracking in the macOS System Preferences, pane "security and data protection", tab "Privacy" at any time you wish should you not have done so during the macOS onboarding process.
In Debian, you can opt-in at setup time or any later time with a simple "dpkg-reconfigure popularity-contest" (even though that one isn't fully GDPR-compliant as you can't easily read what exactly is being done from the same screen).
> So what? You can opt-in to tracking in the macOS System Preferences, pane "security and data protection", tab "Privacy" at any time you wish should you not have done so during the macOS onboarding process.
You cannot opt-in. You can go to `System Preferences > Security & Privacy > Analytics & Improvements` and opt-out, but the default is not opt-in.