Hi there
I'm interested to hear how this goes too!
I've recently received a couple of 1st time users enquiries where the potential visitor's second message is about trying to book outside of Airbnb. First time this happened, we kept politely replying no, we only book through Airbnb, and allowed them to stay thinking this might be a language barrier and first time user - that guest was challenging.
Because of that, as I have another new user, that is trying this approach, I'm flagging it. But I don't know if this suspends the user or that they get a notice from AirBNB that they're message is being reviewed....