My understanding from reading the Apple v Epic court documents is that Apple is unique in that it doesn’t force cheaper prices outside the ecosystem. I might be wrong though.
I vaguely remember the courts being unimpressed with that requirement, and Apple maliciously complying with the judgment by allowing something hilariously minimal and uninformative, like “one tiny in-app link to your main website but you can’t say the word ‘cheaper,’” something along those lines.
(Edited to add: yes, sounds like that came post-Epic, and involved an even more Dantean set of caveats than I’d remembered. Among other things, not only can there be no more than one link, but that one link can only ever appear in one place in the app, it can’t “discourage” in-app payment, and its one appearance can’t be during the payment flow:
https://appleinsider.com/articles/24/01/16/apples-app-store-... )