That's not really true.
The standard, from In Re Walt Disney, is that business decisions aren’t reviewable unless “the exchange was so one-sided that no business person of ordinary, sound judgment could conclude that the corporation has received adequate consideration".
In, Shlensky v. Wrigley, the Chicago Cubs’ were sued for refusing to install lighting for nighttime games: their president believed baseball was best as “a daytime sport." This is absurdly nebulous (and kind of bizarre), but the Cubs nevertheless won.
That decision was based on Davis v. Louisville Gas and Electric Co, which says “the directors are chosen to pass upon such questions and their judgment unless shown to be tainted with fraud is accepted as final. The judgment the directors of the corporation enjoys the benefit of a presumption that it was formed in good faith, and was designed to promote the best interests of the corporation they serve.”
It is probably true that this policy earns Netflix some intangible goodwill. It might plausibly make them more money. However, even if it didn't, it would still be within its rights to implement such a policy.