Well for one a website can make you secretly upload copyrighted content with plain old javascript. And it's going to be hard to hold you liable for data uploads that someone else initiated and you didn't know about.
> Well for one a website can make you secretly upload copyrighted content with plain old javascript
Only to a webserver and thanks to CORS not to any webserver. There is
no benefit for a website doing that - unlike with sharing a torrent to
other internet users.
The problem with torrents is that they are actively watched by
"Abmahnanwälte" (lawyers who make a living by suing copyright offenders).
> And it's going to be hard to hold you liable for data uploads that someone else initiated and you didn't know about
yeah good luck with that. All they see is your IP and then you can try
to explain how this happened and how you are totally innocent.