Earlier quoted context omitted.
Because the NSO group handles dollars. If they didn't respond, they'd lose by default, and the court could order any assets the US can get their hands on seized. If they're getting paid in NIS by countries outside of Israel, the currency conversion happens with dollars as the intermediary. There's the US's window.
How is "Because the NSO group handles dollars" related to "the court could order any assets the US can get their hands on seized"? Presumably, if they were getting paid in bars of gold, the US could seize those too, if they could get their hands on them, no? On the other hand, if they were paid in US dollars, but in cash, that wouldn't establish jurisdiction, nor could it be seized, if the transfer happened outside U…
To seize somebody's gold you'd have to go physically get it. To seize their dollars you just go say hi to their bank. Unless you're an "enemy combatant" the US isn't going to go do extraordinary rendition on your assets, so you're pile of foreign gold is safe.
The reach of the American legal system is long, you don't have to do much as a foreign entity to put you under our umbrella.