Interesting question. I’ve just been reading up on it and I think the answer is legally yes you can sell it, but a lot of people think it’s morally wrong and believe the person should give the items to charity instead if they want to get rid.
I know Jade sold a princess polly jacket on her Depop. In her ad haul she claims to love it sooooo much, but on Depop it’s listed as worn once
(3.15 onwards)
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I think so long as they do their part of the deal, once the ad is over they can do what they like with the items. It’s very shady in my opinion though. In the video Jade is claiming she’s found her new perfect denim jacket. It just shows youtubers will say anything for the £££