How is hosting magnet links that let you download copyrighted material not considered hosting infringing content?
Gun manufacturers are murderers in such a world.
I think you instead meant to imply some sort of intent test. That gets very difficult very quickly. Figuring out how to write the RIAA's perpetual money-machine into law while not destroying section 230 or accidentally banning photocopiers is your next task.
Here is the magnet link for a zero length file.
magnet:?xt=urn:ed2k:31D6CFE0D16AE931B73C59D7E0C089C0&xl=0&dn=zero_len.fil
How is that different than: 978-0262510875 "Structure and Interpretation of Computer Programs - 2nd Edition"