The number of products produced by a given company has never been part of the definition of FANG. And the exact companies in the acronym don't really matter anymore anyway; the overall 'vibe' of it is simply top-tier tech companies, i.e. those that pay the most. Agreed that AirBnb should also qualify, but the exact companies that fit are fluid and it doesn't make sense to keep changing the acronym all the time as the constituent companies change, as the overall idea doesn't change. E.g. consider the Dow Jones index; the constituent companies have changed over time but the name of the index doesn't.