It&#x27;s not the only data that is available for deriving a tracking key.<p><a href="https:&#x2F;&#x2F;panopticlick.eff.org&#x2F;" rel="nofollow">https:&#x2F;&#x2F;panopticlick.eff.org&#x2F;</a><p>Why are you pretending that there is some sort of difference between &quot;tracking a user&quot; and &quot;tracking the user&#x27;s browser&quot;, which is close enough for most tracking purposes? Tracking the browser <i>is</i> tracking a user for a vast majority of people. For browsers on a phone, it is even more likely to be a 1:1 mapping.