Hi @Michele661 yes, Airbnb do this if the guest's account was flagged for any violation of Airbnb's T&Cs. However, they will not tell the host what exactly was violated for privacy purposes.
Here is an additional info about Airbnb's new measures, Airbnb has implemented AI-powered technology to clamp down on unauthorized and disruptive parties, particularly around New Year’s Eve. This technology is designed to identify potentially high-risk bookings for entire home listings over the holiday weekend, blocking those reservations. Factors considered include the trip's duration, the distance of the listing from the guest's location, the type of listing, and if the booking is made last minute. You can check that by searching, Airbnb using AI to help clamp down on New Year’s Eve parties globally. Hope this helps!