I'm pretty sure new PBNs are dead (those built on 2017), they do not work anymore.
But PBNs built on <2016 still works.
I'm using PBNs from different years now and everyone of them actually ranked me with no problem.
On May 2017 I started my first project of 2017… and simply it doesn't work.
I published the contents on May and started my PBN campaign on 1st July 2017.
I almost drop 10 PBN backlinks over the last 1,5 month and serp didn't changed a bit.
There are crappy domain with…