Because they first have to form a whitelist (licensing scheme) before they can put pressure. If no drone manufacturers need to register, for instance, then they can produce drones that can fly anywhere. But once they get all of them to register, then whatever unregistered drone manufacturers still make drones can be excluded from the wider ecosystem.

Thus, for example, they can't just tell browser makers to "ban websites we don't like". But if they make everyone register an https certificate, and every browser maker to register their browser, and every operating system maker to register their operating system, and every computer manufacturer to register their computer, then they can make it hard for a computer manufacturer to obtain parts for their computer, or a license to install the operating system, or vice versa, by leaning on the other registered entities.