I've noticed over the past few years that most of the most successful UK Youtubers come from privileged backgrounds before they started - and like, I mean, REALLY privileged backgrounds.
They live in rich houses in rich areas from parents who have money - and the same goes for Booktubers in general (look at the most popular booktubers - they're either from money or married into money).
Making money off Youtube and blowing up, in the UK at least, seems to be the right of the rich. They have nice houses to film in, money to afford hauls and the money to be aesthetically pleasing. It's just the upper-middle class system, but online.