Drivers discover that Uber limits tipping; company says the limit is 200% of the total, up to $100 to safeguard against mistakes; Lyft's limit is $50 or 200% (Dara Kerr/CNET)

Dara Kerr / CNET:
Drivers discover that Uber limits tipping; company says the limit is 200% of the total, up to $100 to safeguard against mistakes; Lyft's limit is $50 or 200%  —  If you want to leave a generous tip for your Uber driver, you may have to use cash because the ride-hailing app has a ceiling.

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