Also, if you patent 1 feature, can someone else troll you on a subsection of it? eg troll comes after you on a rotating car door handle, what happens if you prior or subsequently patent on a total car ergonomic system? What happens if you patent a rotating door handle in another country?
Reminds me of online gambling situations.
In a severe case, registering the business in another country and accepting payments in bitcoin would prevent a payments injunction from US customers. Troll would have to physically track down a patent-infringer and arrest or extradite. The entire exercise becomes a cost-benefit analysis.
If you accepted US dollars (and then exchanged them locally in Peru, or kept them), say through PayPal or a US based Credit Card Merchant, then I could almost guarantee that is enough to deem your business as operating in the US.
It is incredibly overrepresented in patent litigation. Companies set up PO boxes and shell companies there just for this purpose.