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Hello, Think about domains like wordpress.com, blogspot.com, ... Can Google let these domains be penalized because one or few subdomains have been penalized ? It can't.

Hey Paddy, Great summary man! Your 1,2, 3 = There are lots of other signals as well which Google can look at besides anchor text. Overall site health is essential https://moz.com/learn/seo/internal-link https://blog.kissmetrics.com/site-structure-enhance-seo/ All the best, Tom