Apple is also one of maybe a handful of tech giants with their market cornered, so you can't really compare the two. Netflix has plenty of competition in different "entertainment companies" (like NBC, HBO, etc), Amazon, and Hulu being their major competitors. Unfortunately, the "entertainment companies" are more focused on producing content exclusive to their platforms and refusing to offer their streaming services globally despite the long-term benefits. Hulu and Amazon don't seem as populated with content, and an unfortunate lack of general content quality controls has allowed Netflix to shoot to the top of their game. Netflix knows what people want and do their damndest to fill that demand, or give a semi-decent substitute as a last resort.
It's like with Pornhub. Yeah, xvideo, spankbang, etc exist and, for the most, part, people know about them. The problem is that everyone knows what pornhub is and how to find it. You want your content to be seen, you upload to pornhub.