I guess all industries have lock-out. The moneyed people own everything, and in order to create, you have to fit in. And most really creative people don’t.
Then you have systems that are not locked-out, like Twitter and Facebook, but are subject to revision at any moment. This is imho better than not having APIs at all. At least the world can get a glimpse at the idea before it’s shut down. In a fully locked-out system, new ideas are stillborn.