Yeah in the UK you have to follow the gambling act laws, otherwise it could be considered an illegal lottery. The guidelines are not super complicated, so I’d imagine people not doing giveaways is much more related to the cost and admin time to manage it. If you’re already a successful influencer you probably figure it’s not worth the effort for the small amount of positive PR you’d get (which would be almost impossible to measure anyway). Someone doing it would have to be personally committed to the sustainability / generosity aspect, since it would basically be like setting up a very small charity.