AirBnB should explain to the people offering a room / house when they should tick it, or what the place should conform to in order to be allowed to check it.

But that requires oversight from AirBnB, to the point where they have to send out inspectors or mystery guests, and they don't want to have to pay for that, they want the service to be self-regulating. So the people offering the rooms, if there are no negative consequences to ticking a box unjustly but there will be benefits, i.e. more people viewing the advert and renting it, they will keep doing it.

The only way to fix it is with human intervention and Consequences. AirBnB would be a much better experience if it was curated, if people couldn't make their own listings, if there were Consequences for lying, or if they can't post their own listings but need an AirBnB representative to do it for them. With fines if they change something afterwards.

But that requires money and to give up on some of their profits, they wouldn't want that. It's about volume, not the best experience for their users.