That's not an argument for tipping. That's an argument for organized labor action, or finding a different job. Hell, just work for Lyft (ok, yes, I know, Lyft is not available in every market Uber is); I believe they pay comparably, and also have a tipping culture and in-app tipping.
Then shouldn't Uber be generous and pay their employees more?
>Ask your next uber driver why they are working.
They're working for money, come on man.