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now this problem is occuring in 100s of sites which are hosted on different servers, so the problem is varied
If site: is returning nothing then it's an outright ban and not a penalty.
i just received message in WMT that my sites dont meet google quality guideline
the traffic on all these sites went to ZERO
these sites are hardly 2 months old and were under construction
or news site i am using syndicated content (only showing headline and one small paragraph) with proper attribution and link going to original news source
Google has no right to tell webmasters what to put on their sites.
Aristotle might be partly right in saying that Google cannot mandate TOS on any website. Can they?
Each person can decide for themselves what kind of sites they want to create and what to put on them