robots txt to prevent crawling of freesites

[Halfdeck]

Seems to me most submitters aren't able to produce and submit more than a small handful of mirrors anyway.

It only takes two to tango.

Mirror sites and robots.txt disallow both lead to your LL likely getting no link juice from recips whatsoever. If you want decent backlinks, you might think about accepting only unique free sites. Even then, if you're linking to each other, chances are the link is completely ignored by Google.