It totally depends of the jurisdiction. In some parts of the world calling up a ride sharing app with get you a totally normal taxi at normal metered taxi rates. In other parts of the world its pretty much they do it and nobody can stop them. A private citizen can pick up anyone they want and the laws all assumed that a taxi would have to find passengers and handle money in person. By the time politicians get around to doing anything about it they’ve already taken over the market and voters would take it personally if they had to go back to regular cabs.
Oh thank God. I thought they were bragging about using Twitter.