I have bad news for you: things like the Uniform Foreign Money Judgments Recognition Act exist which makes it possible to enforce foreign verdicts. Even if no such law applies, most US companies that do business with EU customers have by definition some assets in the EU even if only briefly (or else they couldn't charge them anything).

The US doesn't sue foreign pot shops because the sale happens abroad and they have decided to not bother with that but they absolutely could enacted such a law if they wanted. Who is there to stop them? The US actually does apply some of its laws abroad. Here is an example that is similar to yours https://www.insightcrime.org/news/analysis/as-us-prosecutes-...

Again, the problem is only enforceability. If they can't get hold of any money, a verdict is useless.