Why is uber not allowed at airports?

Related questions

1. How far is Quebec from NYC?
2. Is Uber available in Quebec City?
3. Is there LYFT in Montreal?
4. Do you need a car in Quebec City?
5. Does Uber take cash in Montreal?
6. How much is the 747 bus to the airport?
7. Can you use US dollars in Montreal?
8. Does Uber accept cash in Montreal?
9. What US airport is closest to Montreal?
10. Which US airport is closest to Toronto?

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