I watched this family when it was first recommended to me a while back and at that time she had maybe 20k subs. I know there were comments about how "strange" it was that she suddenly blew up to well over 100k in only a month or two, and then now I see she is nearing 1M. The only conclusion is that she buys subs and explains why there are so few comments. I did watch some of her stuff, but then found things feeling creepy when I did, so I quit. I follow other threads here and saw her name pop up on new posts and had to come take a peek
Another thing I need to point out is that I learned from a youtuber that you can pay to promote your vids, which means they will place your content higher up or for a wider audience in the recommendations, so more people are likely to click. My friend has less than 100 subs and most videos get around 50-100 views, but the ones he promoted get well over 2k, so I can see a lot of people taking advantage of this to grow and sustain their channel.