Hi Big Short, thanks for your question, and it sounds like you have a ton of experience on this platform.
I understand from your post that it is hard to get #'s about streaming from companies because they are proprietary. At the same time, do you not agree something needs to be done? Again, this is a platform whose Google Trends are tiny compared to 15 years ago, based upon a stagnant or shrinking Box Office industry now dealt a systemic, strategic blow with studios going straight to streaming (permanent) and the exclusive release window convention broken (also permanent). Will anyone be interested in HSX if, say, a Batman movie can only gross $50 million in Box Office?
Shrinking traffic has got to be a concern for site admins. They surely understand it better than I do. Why else do you increase the movie stock limits from 100k to 150k in the past 3 months, with similar moves for StarBonds and derivatives? Statistically speaking - if HSX's business is to sell movie forecasts to studios and/or cinemas - this is an immediate way to increase predictive power by allowing existing users to predict more. But ultimately that power is temporary because involved users will learn to max out their buys. The only permanent power - with the current business model - seems to be to attract more users.
So that is ultimately my diagnosis here: HSX is losing users over time (again just look at Google Trends), and the Box Office is becoming less interesting. It is not unkind of me to notice this, write about it on the Forum, and propose ideas. It is the opposite. I like HSX, I want it to succeed coming out of these challenges, and if users can come up with ways for HSX to evolve and thrive, that is good for the platform, not bad. And one way (of many!) for HSX to evolve is to measure more things in the entertainment world besides the U.S. Box office.
So here is my answer to your question: come up with a business case and negotiate with the people who have streaming movie & shows data. If only you they have the data and you need it, there is no other way. It's business case time.
If that is too hard, then predicting streaming maybe is not the way to go. Maybe it's not about adding streaming movie data but instead something else.
This could be a very exciting time for HSX to develop in new & cool ways, if a user can suggest a new/workable idea here. I would be interested to know what other ideas have been suggested.