Has anyone used Backlinks Indexer? Good or bad results?
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building 20,000 to 90,000 links total to your backlinks could violate Google Terms of Service and get your site penalized.
This is exactly what I was going to say

I will admit that it is effective to build a few low-value links to a good link. For example, I wrote an guest blog piece on a legitimate, well-read blog recently, but the site posts a dozen articles per day and has a terrible internal architecture for archives. Long story short, the page never even got indexed. I pointed some social links at it, Google found it and the internal links to it, and everyone was happy.
I have experience with similar services, and they are all automatic directories, blog comments, and social bookmarking sites. Read: near-zero value links.
If it's about getting posts indexed - well, that's the easy part, and you damn sure don't need 20k links to do that
If it's about domain authority, don't count on these links helping. That won't really surprise us when we pay less than a penny per link.