Uber revenue in 2022 was 31B. Lyft revenue was 4B. This is not duopoly. Lyft is much smaller, loosing 1.5B per year and the stock price crashed.
They will have hard time to keep the employees and keep the drivers.
Uber made much bigger bets than Lyft. Expanded world wide, launched stuff like eats, and burned a ton of money on self driving cars.