I do not know how this works. but i know its possible since one of my friend has this type of tool in which he scrape any niche relevant site and make backlink to existing content.
he doesnt reveal the tool though. it only take few minutes to scrape and put backlinks to any site. it seems like illegal work. but he manages to get good backlinks from any niche he wants.
here are some links he made using his tool.
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please bid if you understand the project. Do Not Bid If You Want to Increase Your Bid later.
Hello My name is Pranav
I have checked the details shared by you
Please consider my bid and we can discuss more so that
I can assist you in better way about the project
My Portfolio
https://www.freelancer.com/u/amitarai.html