How did Airbnb become the largest hotel in the world?

Airbnb cannot be said to be the largest hotel in the world. It can only be said that it is the hotel with the largest number of rooms in the world, because all room products are not its own. For example, the number of rooms in Hilton/Marriott Hotel is below it, but the rooms are all their own. Airbnb should be said to be a room service provider, or a platform, or an OTA, because it also charges a certain commission after all.