I think the argument I summarized in <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=11171344" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=11171344</a> is reasonable. In a nutshell, they say that we should apply the third party doctrine as if we&#x27;re in a world without third parties. So in the tor case, if they would need to manually transfer information, then the identity of both people would be known. The basic intuition is that technology shouldn&#x27;t allow more hiding. (This is a simplification, read the sources to understand the point being made.)