
The people who are using these streaming services and not paying are (largely) relatives or close friends of people who are paying for the service.
Sure, you could crack down on password sharing and some small percentage of people would buy their own subscription, and then your streaming counts would go down, but the net gain, in terms of subscriber payments is going to be pretty close to nil
And, now, with the balkanization of digital content streaming over multiple services so that rightsholding conglomerates can try to more directly siphon money from people that want to watch shows online, the costs to people go up, and sharing becomes more likely to happen in order to offset that incremental cost.
This is stupid, pointless, and counterproductive, if the focus is on getting as many people as possible to see the value in paying for a streaming service. Either one service with almost everything on it (as Netflix had almost been) for a certain price, or a fraction of that price split up amongst different services makes sense as something lots of people would pay for. The same amount multiplied across multiple streaming services will just get you people sharing access to get a cost they can deal with.
Nothing makes a person more productive than the last minute.