Yes, it says "limit" because Apple cannot guarantee all 3rd party ad tracking stops in every piece of software. What it does is set your personalized advertisin

Yes, it says "limit" because Apple cannot guarantee all 3rd party ad tracking stops in every piece of software. What it does is set your personalized advertising ID to all 0s, making you indistinguishable from 20% of Apple users. That is, it completely opts you out of Apple's tracking ID that the poster was complaining about. I mentioned you can also turn off Windows personalized ID, but for some reason that post (and the instructions) were downvoted. The point remains that the advertising IDs the poster was talking about are optional from both Windows and Apple. Unless you consider the API returning a universal dummy value and not an error to be an issue.