The industry argument for that is “you’re stealing our potential revenue”. I personally subscribe to one streaming service. That’s it. If what I want to watch isn’t on that, I hoist the anchor and set sail.
The predictable way that video streaming services became content islands and actually a worse user experience than cable really shows how the industry would rather provide worse experience and cash grab than attract more customers naturally. By contrast, I can subscribe to one music service, and listen to literally every artist I can possibly want to. As soon as video streaming does that (at a reasonable price), piracy for video will plummet like it did for music.