What happens if I can't pay AWS bill? Will there be any legal charges against me?*

Yes, of course. As there should be.

• At the minimum, you should expect to face a breach of contract lawsuit.
• In all likelihood, you should also expect to be chased by debt collection / recovery agencies.
• In the worst case scenario, you may be hauled up in front of a bankruptcy court.

I’ve noticed that American and German companies have a very long reach. They somehow manage to get to their debtors, even those that have decamped from their original address / cities / countries.

*: This is the original question I answered. I’m repeating it to help me make sense of my answer in case it’s moved to / merged with some other question that I didn’t answer.