And likely also because they know how stupid and indecisive people can be. Also if any of DW staff has worked customer service, they probably are fully aware that when people have disputes with each other, they often will fuck with that person's accounts. A company like DW has to take a stance of we're not responsible because not doing so means they'll get stuck being involved in people's personal disputes and those can get nasty and even involve the police, courts and lawyers. No one wants to get involved in shit like that if they can avoid it.