If Amazon decides to cough up $9B for the corporate messaging app Slack, it will pay the equivalent of 9 times the valuation of a Netflix customer, or 4 times the price of a New York Times subscribers — two companies that managed to build actual barriers to entry.
Amazon to pay $6,000 per Slack user? Come on.
Frederic Filloux

What are the Barriers to entry for the NYT?

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