Sure. Let’s be clear: The DMA won‘t apply to non-EEA countries.
Apple can do as they please in other countries, if they so want to segregate their markets.
They don‘t have to allow sideloading and alternative App Stores in the US, UK, South Korea, elsewhere. Well… until those markets follow suit with their own similar legislation sooner or later.
as someone else pointed out, we will enjoy those screenshots of cool stuff the euros are doing with their iPhones that US people can't because apple is greedy and wants to gatekeep for a device you own like little dictators. That should go over swimmingly.