This so much. Although I don't think too much of the influencer/yt 'lifestyle' because it seems to be spent doing a whole lot of nothing in a lot of cases like Millie's, it can be a good career and in some cases can set you up financially for the rest of your life. She really is just underselling herself as you said and promoting such dangerous behaviours to her young viewers. Nothing wrong with PS if you do the research, know the risks and do it for the right reasons but it's clear that Millie doesn't. It's not a good message at all.
She's definitely a smart girl, just makes poor choices which is unsurprising considering she's not had the easiest time, is surrounded by tit friends and won't confront her emotions.