Uber has recently introduced American style tipping to their apps.
Tips are tax subsidies in disguise. The tip is from the rider’s taxed income.
Uber should be paying tax on their income They’re trying to avoid this by lower fare rates and insist riders tip the driver directly.
Assuming it goes the way Uber want it to go.
Customer tips > Uber can pay driver less whilst driver stays "happy" > Uber can be more competetive with their fares > maintain/take more market share