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I just went thru the list of apache mirrors and looks like that good amount of sites their for link building. I dont know why Hoobly are not indexed by google because I checked their robots and there are no restrictions there, but other sites on the list are using it for link building for sure, Dont you think that even without link to primary site they still getting overall DA ?

Hello,

I notice that some sites do provide hosting for mirroring file downloading for cpanel, apache and other big developers. I assume that benefits of it is link building but look at this site:

http://apache.mirrors.hoobly.com/

Hoobly provide mirrors for most developers but none of them are indexed by google for ex:

http://apache.mirrors.hoobly.com/

So can someone explain why would be that or what is going on ? is that something hidden here ?