Via your mouth (for phones) or your browser (for the internet), you can control what information you give/send properly. If you have code executing on your mac

Via your mouth (for phones) or your browser (for the internet), you can control what information you give/send properly. If you have code executing on your machine, you can not control what information that code will take (unless you know that it is 100% safely sandboxed) And AFAIK, Stallman doesn't spend a lot of time "directly" connected to the wide web, as tracking leads to forcing the user to give information they don't want to give (short random distinct interactions with the internet are fine, as long as they are short enough to not allow for inferences to be made)