Every developer who has a website will have an an option to download an ipa that they can download for a discount compared to the Appstore. If you like to buy from Apple, you can do that and pay extra. Those who do not want to, will download the ipa and install it. I do not remember the names but there are some apps that cost less and offer more functionality when downloaded directly from the developer's website and in some cases, they are free on the website but have a nominal cost when purchased from the Appstore.One question I have, is there any app or subscription that would be cheaper if allowed to be installed directly or have external pay link? Hasnt been the case with Netflix, Max, Peacock and a few others that I have. This really is not to support the consumer.