Except most of what you "discover" is actually more of the same. That why we have so much divisiveness in our society, people are unknowingly in echo chambers so deep they don't know anything else exists.
It's just not a great argument against YouTube since "accumulates everything I do into their DB and AI" is something both services do in the name of better recommendations.
Netflix business is not to accumulate data on you and resell it, or to display ads.
Netflix was not part of the PRISM program.
Netflix is not Google.