> Traditionally an extradition treaty would require the crimes to have occurred on US soil.
No, they wouldn't have. While each extradition treaty is to an extent sui generis—they are individually negotiated, not boilerplate—extradition under such treaties for non-digital, meatspace offer see where the accused's acts at issue are not charged to take place in the physical territory of the extraditing country are often within their scope. In particular, no territorial restriction on the location of the offense eligible for extradition appears, unless I've overlooked it, in the US-Greece extradition treaty, which long predates the digital age.
No, they wouldn't have. While each extradition treaty is to an extent sui generis—they are individually negotiated, not boilerplate—extradition under such treaties for non-digital, meatspace offer see where the accused's acts at issue are not charged to take place in the physical territory of the extraditing country are often within their scope. In particular, no territorial restriction on the location of the offense eligible for extradition appears, unless I've overlooked it, in the US-Greece extradition treaty, which long predates the digital age.