When it comes to major U.S. industries, three tends to be the magic number.

Historically, auto manufacturing was long dominated by Chrysler, Ford, and General Motors—the so-called “Big Three,” which at one point controlled over 60% of the U.S. auto market. A dominant trio shows up elsewhere, too, in everything from the U.S. defense market—think Lockheed Martin, Boeing, and Northrup Grumman—to cellphone service providers (AT&T, T-Mobile, and Verizon). The same goes for the U.S. airline industry, in which American, Delta, and United fly higher than the rest.

The rule of three also applies to what Americans watch; the glory days of television were dominated by three giants: ABC, CBS, and NBC.

Now, in the digital age, we are rapidly moving to a “Big Three” dominating streaming services: Net

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