IDK about how the big tech corps takes adventage of it, but in general I think that’s an important concept. Here’s an example why:

Let’s say you developed a website that charge some money for a service, obviously you developed a server side and a client side. While the user have access to the client side, he can’t even reach the server side files. If someone would’ve steal your server side files and share them online, no one will use your service, that you worked hard on inventing it and implement it, any more. That’s a theft, and copyrights laws are suppose to help us make sure it’s illegal to do so.