So I have just received a booking request from a guest who's profile name is an email address. 
I have asked the user if their name is actually an email address and had no response.
I have reported the user to Airbnb but they seem to A okay with this.
Airbnb have choosen to hide the guests profile picture until after they have booked in case of descrimination. I suppose when your name is an email address Airbnb have to hide that too in case of off platform contact, or maybe there is also email address descrimination.
Now as a host I am not allowed to know anything more than 'something' wants to book my place.
I guess the positive take away from this is an email address couldn't make too much mess.