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The question was: What if a competitor takes a site that has a severe penalty and 301 redirects it to my penalty-free site - would it cause my penalty-free site to get a penalty?
John Mueller basically said he has never seen a case like this where it ended up hurting the site. He said that Google is usually catches these situations fairly easily.
"I read this as an indication that Google is confident that it can spot most cases of negative SEO "fairly easily"."
there is no sign on them in Majestic nor AHRefs