@Mark116,
It could be a result of online articles like this regarding the use of Airbnb for event planning: https://www.eventmanagerblog.com/airbnb-booking-for-events. Now it appears that the idea of using Airbnb to find an event location has gotten into the wild.
Plus, I think many traditional venues may not be taking reservations, because of gathering restrictions in their area, and they don't want the responsibility of policing the number of people who attend the event. I can see some disputes, "Well, it's only 48 people now, because two people left. So, I called my two friends and said that they could come. We're still at the 50 person limit." Or, the original two guests come back, "Why can't we enter? We just had to run out to do XX, but we were not planning to leave permanently." Also, it's difficult nowadays to hire people for side gigs as catering staff and servers, because it messes with their unemployment benefits.