Could you explain how platform exclusivity is a dark pattern? When I think of dark patterns I think of misleading ways to get a customers information where not

Could you explain how platform exclusivity is a dark pattern? When I think of dark patterns I think of misleading ways to get a customers information where not applicable. I don't see how it's a dark pattern if I can't watch Game of Thrones on Showtime or Orange is the New Black on Hulu. Why is retaining rights over content creation a bad thing? Is it a dark pattern to have companies pay for licenses or copyright fees?