As Jojo connects with her community/audience on her YouTube Channel and giving a review to fulfill other people's curiosity, she buys the 23andMe DNA Test and showcases her results with her Mother.
Sharing the results to her audiences brings her community closer to her because it elicits an emotion.
People are always curious about themselves, especially where their family is from.
So not only is she entertaining her audience, she's attracting other people that would want to buy the same product.