Technically it may be purged by blackhat SEO, because google search result ranking algorithm is poor actually and can be easily gamed by anyone who has 100 doll

Technically it may be purged by blackhat SEO, because google search result ranking algorithm is poor actually and can be easily gamed by anyone who has 100 dollars in her pocket. Only because Bing/DDG SERPs were not gamed by "SEO" activity doesn't mean it can't be done and/or those SEs algos are any better than Googles.