The US is an anomaly in drip-pricing sales tax at the register. It's normal for sales tax to be part of the list price. It's one of the things travelers to the US are frequently outraged by, as well as our "pint" glasses (16 oz) that are smaller than an imperial pint (20 oz) or metric equivalent.

As someone else in the thread pointed out, some locales do require that AirBNB and similar list prices with the fees included, and they comply in those regions. And not including tax is kind of a con when the rate can vary between states, cities and even parts of cities. Nobody can be expected to know the particulars everywhere they go, while businesses are legally required to know in order to collect.