[acdha]

This requires equating “stupid” with “all”. Once you recognize a concept of copyright, lawsuits are inevitable once you allow users to share files.

All you need at that point is one copyright holder who believes – right or wrong – that you are in sufficiently zealous about protecting their content and, poof, lawsuit. This goes treble if you have money and the actual infringer is likely to be a broke college student in another country.