There's reason to believe that a shared catalog would be more profitable for the non-Netflix streaming services, not less. It's not like it's hard to track who watched whose IP and distribute the revenue appropriately. The current system benefits Netflix who try to convince people to watch Netflix originals and dump everything else. It's not just a competition for subscribers, it's a competition for screen time too. There's a lot of good content on the other streaming services but it's too fragmented to pay for.