With all the ripping off and poor customer service, I almost never take a cab. Especially not since Uber/Lyft became popular. On the rare occasion that I do use a cab or ride service, I tip if I am provided exceptional service, including baggage handling. The last time the hotel used a cab to get us to the airport, the driver never bothered to get out of his seat, the car was dirty, and it smelled like he had just finished his favorite tobacco product. No tip.