It is no longer possible to book train tickets in Germany without providing your verified email or phone number. FYI, all phone numbers are linked to national ID cards in Germany.
https://www.thelocal.de/20230925/everything-that-changes-in-october-2023-in-germany
Meanwhile in the USA you can buy a car from a dealership without a license or insurance and without registering it if you know where the non citizens go.