Laws vary from country to country, state to state, and they vary tremendously. Laws are also changing all the time. There's literally no way to predict what rules will be in place at any given time.
Also, adding code to meet some government regulation takes time and effort that (form the company's perspective) could be better spent building a product and making money. No one would "choose" to implement some random compliance rule unless they're forced to.
It would be good for US companies to know that EU laws are not "guidelines", just as US enforces their laws on companies from outside.
This looks to me like yet another bet from Apple: "they'll buy iPhones anyway, let them wait".
Bad comparison. Launching with GDPR compliance isn’t particularly taxing if you’re already complying with California’s CCPA. (You need your twenty-eight EU law firms on retainer, but the big firms package that conveniently.)
Copyright theft in AI, on the other hand, is a global phenomenon.
DMA is most akin to the U.S. system of designating financial institutions SIFIs and then putting a bunch of extra requirements on them. Almost intentionally onerous. Hence ringfenced to select large companies.