I think it&#x27;s mentioned in the commit on uBO: <a href="https:&#x2F;&#x2F;github.com&#x2F;gorhill&#x2F;uBlock&#x2F;commit&#x2F;ba05804060ec7c4399c8286ed7fb95f2b8f83e06#diff-2269d70bc56a54c25a78533cf13f5657R39" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;gorhill&#x2F;uBlock&#x2F;commit&#x2F;ba05804060ec7c4399c...</a><p>But basically making external calls to any outside site leaks information (metadata). Some people really don&#x27;t want want to be tracked. period.