I’d like to correct you by saying that GPL is DEFINITELY enforceable in countries other than america. I can’t say about every country (tho that will be the case with every license), but for instance it’s definitely enforceable in europe. For example in Germany and France there have been a few lawsuits that the FSF helped carry out against immoral companies.

GPL Enforcement Cases - FSFE

If you’re in Germany the Institute for Legal Questions on Free and Open Source Software is a law firm that literally works only on enforcing the GPL, FOSS licenses and other technological human rights that are being ignored by big tech.

If you want to be even more sure about European Enforcement you may want to checkout the EUPL v1.2 which is GPLv3 compatible.

In other countries, such as Japan, the GPL is also enforceable, so long as you treat it the same way as copyright, so you’re willing to sue companies that you know are stealing from you (the FSF can help you if you can’t afford it).

Russia and China don’t care, but… it’s Russia and China, that’s not really news, is it? :)

EDIT: I will write a full article about the legal enforce-ability of FOSS licenses such as the GPL before the end of the year