It is upto the community to take action. There is no reason to vote extremely high KE individuals who post frequently and has high rep. There is almost no reason that I can think of when these 3 things converge and are all high

• High KE; say higher than 3-5
• High Rep; say higher than 70
• High post frequency, more than 5 times a week

If that is not a curation program then that individual is a definitive extractor.