One can easily and inexpensively (sometimes for under two dollars per unit) procure products like the Tip-N-Tell and TiltWatch (and likely others). Or make a tube with dyed water in a bottom reservoir and white cotton on the top if deciding on a homemade solution. There is a lot of prior art. Accelerometers could also be used, but the expense would increase for the components.
Eggs can be shipped. It is a gamble. Some customers may be willing to trade the gamble of getting (effectively) nothing for the potential of getting the full incubation and hatching experience. An advantage I did not see mentioned is that the customer, assuming the egg arrives safely and fertile/viable, has the ability to customize TSD of the embryo (assuming they know how to accurately do so and want to).
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