In theory, someone with enough technical skills could create a script that tracks which IP is downloading which video. In practice, thisis much more difficult because:
It can also be displayed on external websites to promote yourinstance, such as <x id="START_LINK" ctype="x-a" equiv-text="<a target="_blank"href="https://joinpeertube.org/instances">"/>JoinPeerTube.org<x id="CLOSE_LINK" ctype="x-a" equiv-text="</a>"/>.