It's right there in black and white under the "In-App Purchases" section.
> “Trying to join Netflix?” it reads. “You can’t sign up for Netflix in the app. We know it’s a hassle. After you’re a member, you can start watching in the app.” Bizarrely, it gives no further instructions on how or where to go if you want to sign up for Netflix: no URL, no QR code, not even a hint of how to join. If you aren’t already a member, it’s a complete dead end.
That’s not a bug. It’s a function of Apple policy. With some exceptions, the company doesn’t let users pay app makers directly for their apps or digital services. They can only pay Apple, which takes a 30% cut of all revenue and then passes 70% to the developer. (For subscription services, which account for the majority of App Store revenues, that 30% cut drops to 15% after the first year.) To tighten its grip, Apple prohibits the affected apps from even telling users how they can pay their creators directly.
https://onezero.medium.com/apples-secret-monopoly-5718272c16...
It's not possible to initiate one.