Similar to that jets effectively would be grounded the second that the US decides they would not be exportable to a former ally, my guess is that not many would, in this scenario, believe a former US owned AWS region in Europe to operate completely autonomously to the degree that it can be “easily” nationalized.
But long before that, I believe there will be other noticeable effects.
As someone working in a medium sized European company, with substantial investments across private infrastructures, AWS, GCP and some Azure, I can testify to that since last couple of weeks the Public Cloud Exit strategies around having services being prepared is a very hot topic. This concerns both existing services preparations as well as enforcing standards and configurations for new services.
Mosaic had support for XBM format prior to introducing color images. I did set up the Office of the Swedish Prime Minister around February-March of 1993, on a SUN SparcStation 1 if I remember correctly, running in a cabinet on a floor below the actual office on a 64kbps leased line. It was really a gopher site, but with that XBM support, albeit only black and white, found it useful to create an HTML “welcome” page to that gopher content of press releases, talks and articles.
Claude does seem to be explicitly blocking people living in GDPR jurisdictions to sign up. I don’t know what to make of that, but this statement from the first paragraph rings false.