@Jamie206 It's happened to me previously: it's usually a trust and safety issue, and it usually indicates that it's a guest you wouldn't want anyways. Some possible issues that would cause the profile to go poof:
- The guest has already been previously banned from the platform, but they came back and made a new profile.
- Airbnb find that they have a criminal record (they do background checks in the US and some other places).
- The credit card is being used fraudulently.
It's always possible that it's a mistake on Airbnb's part, but it's entirely plausible that it's not. Airbnb won't disclose anything, but I'd just consider it a possible lucky escape and move on.