I'm not a lawyer but my understanding is that determination comes down to 3 points.
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An employee uses company tools and materials. A contractor supplies there own. If Amazon supplies a truck I think this would lean towards employee.
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A employee has set working hours. A contractor sets there own hours. I think this leans more on contract cause I thought the point of flex was you make your own hours.
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An employee can only work for one company at a time. I don't mean you can't have 2 jobs but you only can do one at a time. Like you can't be a doctor at one hospital and then also be a doctor at another hospital that is competitive. I don't know Amazon's policy on this. Are you allowed to be both Amazon flex and work for like UPS?