Exactly. Very low risk for them. If the call goes nowhere, they hang up and move on to the next target. The previous target thinks it a bit odd but what are they realistically going to do about it?
It works the same as those "We are from bank X, give us you accound details" scam emails. They completely miss people that don't use bank X but it looks much more legitimate for those that do.
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> What if they say "I have three computers, which one?"
"We're going to need to check all of them."