Answer: Yes, if they are insured to drive the car and the system cannot distinguish between drivers.
Casual lending has an extra cost with telematics
With an ordinary policy, the main concern may be whether the friend is insured and what happens after an accident. With black-box cover, their everyday driving style can matter too. If the saving on the policy depends on good data, think carefully before handing over the keys to someone who drives very differently from you.
Legal cover and telematics consequences are separate questions
A friend may be properly insured to drive the car and still produce data that damages the score. The fact that the journey is lawful does not mean the black box ignores it.
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