There is one site on my niche and this site gained almost 2 million traffic withing one month and the best part is it is new site. When I looked up for ist backlinks, I found that it has not many backlinks and even domain rating is less, both DR and DA is very less. But it is ranking for many high search volume keywords and at first position. and I am sure the website is using PBNs because there any not many backlinks visible when I use the Backlink checkers. How PBNs get hid from these tools?