First of all, "sewed" refers to the act of using thread to stitch garments back together. The term you're looking for when bringing legal action against somebody is, "sued."
And to make this even more simple, let's make this into a juice stand scenario.
Let's say your juice stand wants to sell other kinds of juices alongside your own blends and juices you've made. Well, let's just say that your neighbor the next street over makes the juice you want to sell at your stand. So you saunter on over and ask him that if you share some of the profits with him, you can then sell his juice at your stand and make a killing.
The juice stand in this situation are what streaming services like Netflix, Hulu, Crunchyroll, and such are. They're just stands and libraries that showcase content that they and the owner of the rights to that content agreed to show through some sort of mutually beneficial deal.
But your neighbor, the person making juice, is firmly within his rights to say no, and offer his own juice stand to sell his own juice on his own street, hence why there's various streaming services, and sometimes you can't get certain products in certain countries, it isn't just limited to content like TV, movies, or music, but anything really.
That's one reason.
The other reason is this thing called laws, and some governments are more authoritarian than others, and may just block access to certain content, even if there's rights to showcase that content there. Not only that, but different countries have different copyright laws, so that's another reason.
Basically,
@Stitch got this one right. It comes down to who holds the rights to showcase the content, and governments and laws. If you ever needed a more compelling reason to use a VPN, I'm not sure you'd find a better reason.