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He has many, many accounts over which his Steem Power is invested. Swarms of bots, as it were.

How many other accounts does he have? Sounds like abuse to me........and why isn't anyone doing anything about it?

At least 50. There's nothing against the "rules" about having multiple account, just against getting the first-time signup account, with free Steem.

Using something like AnonSteem, anybody can have as many accounts as they would like. They just have to pay for each one. I believe witnesses can effectively just create them.