Having a team completely unavailable during the USA working day is a real pain for collaboration and it's hard to sue people in other countries that "borrow" your source code to make their own version. Also, knowing exactly how to pay (say) a German developer and how taxes work and what the labor laws are is always an issue.
Aside: The very best contractors I ever hired were Ukranian. So many absolutely fantastic talents at around $30 an hour. Then Russia invaded (the first time) and annexed Sevastopol and the USA made it illegal to pay them any more.