True! Unfortunately, I fully expect Apple to keep alternate app stores locked out in other locales. I'll be happy if I'm proven wrong, but they've been so determined in fighting this that it seems likely they'll consider it to be worth the extra work.
We don't know how the DMA will actually be interpreted.
There are three aspects that people often conflate, the ability to install apps from outside Apple's App Store, the ability to install apps that Apple hasn't notarized, and the ability for developers to skip paying a percentage of app sales to Apple.
We might get all three of these, but we might also get just one or two. I can imagine a world where you'll be free to install a .ipa from any website and pay for in-app purchases with your credit card, but where the .ipa will have to go through App Review and the developer will be audited to ensure that the necessary fees go to Apple.
