It's no more shallow to copy an influencer than it is to buy something you've seen in a magazine or advertised on television, or to see a stranger on the street and be inspired by their style.
People really, really like to snobby about influencers and I really don't know why. They're just people - mostly young women - making a living through creative marketing. I follow influencers whose channels focus on books, art/craft, cooking, interiors and style. I wouldn't say I 'copy' them but I enjoy their content and get inspiration from some of their recommendations. So what?