Let's say you link your client sites together, to your site or even to thier sites from yours. Let's say one of those sites gets flagged for a manual review. If they can establish a "relationship" between the banned site and any of the other sites through any "questionable" SEO practices or relationships I'm sure they will poke around . So why expose yourself and other clients to risk when you don't need to?
Now I'd never reccomend that anyone set up a fake SEO website with a few months or years history to offer up as a sacrifice in a reinclusion request when a client does get banned.
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