I can't find an example online but there used to be a ton of these kinds of sites called "Top Sites".
It's where people put a listing of the top 20 sites on [subject] and you promote it on your site and ask people to vote for your site. The more "clicks" or "votes" your site gets, the faster it moves up the "Top Sites" list. It's just a big chain so everyone is promoting this same link list in an effort to promote their site.
That's one example. It's harder to find these now because people realize they don't work but they used to be everywhere.
I am so skeptical of any company that says "boost your links" or increase your link popularity these days. Most of the time it's some artificial way that doesn't work and the engines ignore them.
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