This is only good for Anthropic because chatbots learn from their users. I remember back in the mid-2000s on a forum, someone linked to their chatbot and asked everyone to use it so it could learn. I asked if it could learn Esperanto. The dev said, yes, but please don't teach it that.
The interesting thing is, this rule reveals how easy it is to sabotage LLMs. If FuckAI got together and started feeding it gibberish, there'd be a new rule banning people who do that.