I take professionalism to mean you know your craft. Like for example setting the TTL on a DNS server to a year won't cause downstream services to cache the record for a year but instead something on the order of a few hours to a few days in practice.
To quote RFC 2181:
"Implementations are always free to place an upper bound on any TTL received, and treat any larger values as if they were that upper bound. The TTL specifies a maximum time to live, not a mandatory time to live."
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.
