It was easier to trick PageRank back in time. Today, they cross validate the search results against DNS queries in a specific region and from their tracking sc

It was easier to trick PageRank back in time. Today, they cross validate the search results against DNS queries in a specific region and from their tracking scripts embeded in pages too. They are getting a lot of data from ISP, Wifi access points, their own 8.8.8.8 DNS service, and even their mobile operator project fi. So, even if you manage to trick the linking part, you'll not pass their other filters. It's much harder now but still doable provided someone is willing to foot the bill for such an operation.