GM's Cruise U-turn is a sign of just how hard the robotaxi game really is

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• General Motors just pulled the plug on Cruise's robotaxi dreams.
• The self-driving venture has been in doubt since a pedestrian was seriously injured last year.
• GM's decision is a warning for the auto industry that time and money may not be enough with robotaxis.

General Motors' decision to pull the plug on Cruise is a warning for the rest of the auto industry that building a robotaxi business is hard...