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can only answer second question:
google has api access to namecheap if your using webmaster tools, so yes having domains beeing
on big gs blacklist and having them registered at namecheap may hurt your other domains too..
also i noticed myself sometimes beeing punished and every domain whatever niche on the same subnet as well even without interlinking..im sure they crosscheck registrar data i noticed its good to allways register every domain under a new name..
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