Google could pay competent decision-makers to review every complaint about an account disconnection, but the cost of employing that large, skilled workforce vastly exceeds their expected lifetime revenue from a user like Mark. The fact that this results in the ruination of Mark's life isn't Google's problem - it's Mark's problem.
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The cloud is many things, but most of all, it's a trap. When software is delivered as a service, when your data and the programs you use to read and write it live on computers that you don't control, your switching costs skyrocket. Think of Adobe, which no longer lets you buy programs at all, but instead insists that you run its software via the cloud. Adobe used the fact that you no longer own the tools you rely upon to cancel its Pantone color-matching license.
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