Earlier quoted context omitted.
Because they can sell more views if paying customers are happy. I refuse to pay for Netflix because even if paid I wouldn't be able to watch the content (including Netflix originals where the "rightsholders don't allow it" argument doesn't make much sense) in reasonable quality. Meanwhile, people can watch it from an unlicensed source without paying (legality varies by country but generally low risk for users), and a…
I'm all against DRMs but the friction nowadays is, if you stick to one platform, almost zero, way less than your average pirated experience. Now, if we talk about platforms balkanization and how you have to shell out 50€-$/month if you want to enjoy just the best content from major platforms, that's another topic.
At some point streaming will devolve to that, and it will be back to torrenting as the content providers kill the goose that lays the golden egg