They aren't because companies refuse to price discriminate. There are some exceptions, like Spotify where they called it out in a public space that the in app subscriptions were more than if you bought directly.

However, I have noticed that its very rare. In every other case I've looked into, from Omni apps to streaming apps like Netflix, I'm paying the same either way, and often with a more convienent way of managing the subscription.

Thereby, I think it goes undetected by most, because price comparing the app store to the non app store price will yield the same price most of the time. Though importantly, I have noticed, it is not always the same options. For example, regarding Netflix, I am paying the same price for my sub via Apple but new and returning customers can no longer pay for it this way, they must go to the website now. I also can't add additional members (effectively discounted second subs) either.

This has to do with the fact Apple did captiulate to allowing companies link to their own subscription pages and actually allow customers to be directed in that way with clearer and transparent language. However, I have noticed most apps with the exception of large streaming platforms have done away completely with in app subscriptions, and the prices are still the same whether its the web or via in app purchases on Apple's platform.

However, Google Play is no better in this regard. Even though they allow 3rd party payment processing as an alternative to using Google's payment processing, it has not lead to apps being cheaper on their platform, in the majority of cases. Which makes me wonder if the value is still there for a 1st party payment processor, or something else.