Because I have a three-night minimum, the party ban has never kicked in on my listing. Also I only list for one guest in a private room in my home, so partiers would not logically book here.
However, I have read enough posts from guests and hosts who were affected negatively by this algorithm to say it is not a very effective way of preventing parties, and is applied indiscriminately to situations where it shouldn’t be, and it should be left up to the host to do their own guest vetting and decide whether there are red flags.
For instance, hosts have had bookings from lovely repeat guests blocked by the algorithm, just because the guest may only require a one night booking.
One guest posted that she was being blocked by the algorithm, even though the purpose of her travel is business related, she is travelling on her own, and she had a couple dozen 5* reviews from past stays. This is ridiculous and of course turns a guest off booking through Airbnb.
Other guests were young families, mom and dad, who happened to be under 25, and their toddler and baby. They were certainly not booking to throw a party, and understandably needed an entire place. Yet were blocked from booking.
And, as others have pointed out, this algorithm has nothing to do with Airbnb caring if renters throw a party and trash the house (which can be done by people in their 30s, 40s and 50s- it’s not behavior exclusive to under-25s) and disturb the neighbors- if it did, Airbnbs which get constant complaints from neighbors as party houses, would be delisted, and guests who do these things would be banned from the platform, neither of which happens with any consistency. To the contrary, hosts who cancel the rest of a booking due to the guests being disruptive are penalized for a cancellation and the guests are refunded for unstayed nights.
The party algorithm is purely about Airbnb attempting to protect itself from bad publicity.
And, as has been pointed out, the algorithm being applied across the board to all entire place listings is totally unnecessary- guests can’t get away with throwing parties at listings where there are onsite hosts.