I'm not a lawyer, but what about those ubiquitous statements about how things are "provided without warranty"? It's clear that this guy is concerned about being liable for what could go wrong. Also, I'm not sure if laws and expectations are different in Germany where he seems to be based. Edit: sorry, his domain is .NL, but I thought otherwise because it seems a lot of people he cites working with in the readme have a .de domain.