From my knowledge, it is safe. At least as of now. But there are many factors thats too artificial about it, unless I am mistaken. Even with aged domains, different IPs, different PRs, they dont seem natural to me and google will eventually catch up on it. 1. domains: google can find out all the domains thats linking to you had been dropped or expired. 2. links: although inbound links can be diversified by purchasing a good expired domain, they have very unnatural looking outbound links even if you diversifying it. Also, building automated T2 on these PBN look very unnatural. 3. page: google probably has(or will have) a page snapshot tool that can compare and find out these domains have totally different snapshots. (site category, type, coding structure, etc). To me, it seems manual guest posting is the only way to get a good T1 backlinks (followed by T2, T3 spams). It is costy and time consuming (to contact the webmasters and ask for guest posting), but that is the only way to build a future proof natural looking links. I am seeing so many people are going for PBN, but they are as costy and ineffective. (Its going to be cheaper if you make 1000 sites for your PBN. And let these sites talk about anything about earth and use this network for multiple money sites. But it leaves too much footprint for future google updates) Sure you can go 100% future proof PBN but thats going to be really costy: Good PBN can only be used for sites that shares same niche category. And each sites should have many unique hand written contents and look like a real site. Size of the sites and design themes, CMSs must all vary, even coding structures, just to remove any type of the foot prints. Let say guest posting costs $50-$100 per link. But its like you are paying $50-$100 for a very well established natural looking page thats giving you additional traffic and juice. Building another Tier with tools is also effective on these, because the page and the domain already have many traffics, links and etc. Can you build and establish a real good site for $50-$100(A site in your PBN)? Dont you all think Manual Guest Posting is the better way than PBN? (longitivity, google updates, cost effectiveness) Please criticize and correct me if im wrong.