The DLP app, whilst very basic, allows purchases from international guests.
I can order from Temu or Shein via their apps without a problem.
I find it hard to believe that Disney have come across some regulatory issue that no one else has. Or that everyone else ignores, including the Capitol
Maybe
@CaptainAmerica is close when he said purchasing a digital service being a problem, although I can book a digital audio guide to tourist attractions in different countries.
I think it takes away any incentive to stay onsite.
Many will come and decide to focus on Universal, Busch Gardens etc and maybe just do a couple of days at Disney instead of the other way round.
Personally it makes me think about doing a short city break first, then spend 3-4 nights at Universal and then a week at WDW.