This is an example where they were ahead of the industry with distribution and now that their competitors have invested in infrastructure/distribution, supply chain (movie/show production takes time), marketing, and have competing products the competition is fierce when your price is the highest.
Now replace Netflix with Tesla and this could be the same case in the automobile market in a 3-5 year span. Market leader because they lead the industry in one element but once that tech (batteries/EV/charging network) is commoditized, the market leader could suffer.