When entering the US market, non-US companies and entrepreneurs need to understand whether and/or how their products or services might infringe upon the intellectual property rights of those already operating in the United States.
Violating someone’s IP will not cost “only thousands of dollars in fines”. Violating someone’s IP could result in a court-ordered injunction against further importation and sales of the accused device/product, an order to pay significant monetary damages (possibly in the millions of dollars), and an order to pay the other side’s attorneys’ fee.