No, they are not. Epic and a lot of others would just go without Apple App Store if they could. They don't need discovery. They are adding value, but that value is for themselves, in form of a 30 % cut. That's not good for consumers or developers.

It’s great for consumers and developers, the security and ease of use of the walked garden is primary reason customers spend 50% more on iOS than than Android, despite Androids six times larger market size.

What's good for a consumer like me is installing whatever the fuck I want on my devices.