I've just been in contact recrntly with Esteem team and i figured out they were big scammers, They managed to make many accounts climb to a high rep.
They auto vote comment with the more chance to earn money to them
And they use these bots to make other bots with high rep to earn more money.
You should be carefull about them...
Ps: there is some screenshots with list of their bots
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From @hazooka