Professionalism, at least to me, implies both competence and tact. Its nice knowing that they're capable of offering services but its also nice knowing that if/when things go wrong whether by my own mistake or not, I will be treated respectfully. What those quotes of their ToS tell me is that they're willing to belittle clients on their perceived take on events.

The short explanation is that if shit goes wrong I don't want to deal with people who figure communication among clients should be handled that way.