I had an Uber ride from a driver who accused Uber of paying a lower surge rate than what the passenger was paying. I assured him this wasn't the case but he insisted it. I told him exactly what I was paying, gave him my personal cell number and told him to call me if he collected less than this amount (less the Uber %). He never called me.
A lot of people have suspicions and conspiracy theories but Uber would not be in business if it did things like this. Most of the Uber employees believe strongly in what the company is doing, around the world, and exploiting women by charging them higher fees is not something we would tolerate. That's not how a sustainable company makes money.