Inaccurate way to calculate. More like:
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Take value of a third party company (say, Apple) to make a viable competitor and take 1/3 of their revenue. $1B to build and marked a product to earn $10B a year = no brained.
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Once a viable option exists from a company that is more trusted and doesn’t have a history of revealing customer data intentionally (and taking breaches seriously), THEN ask customers how much they’d pay to switch.
3). Multiply that $0 by # of users. Zero times a billion is still zero.