Because I'm not limited by what the store decides they want to sell me. For example, there's no PornHub application on the Apple App Store. Similarly, Apple has been under fire recently for blocking streaming games, such as Microsoft's Xbox Cloud Streaming or Google Stadia even though it's functionally not different than Netflix's movie streaming, just with input. Or even blocking Steam's remote control Steam Link app from accessing the store: https://arstechnica.com/gaming/2019/05/apple-reversal-allows...

Does them blocking those help me in any way? No, it is just to protect Apple's profits because they want to take a cut. You can't even pay for Netflix through the app, because Apple want their cut.