The problem is the weight you vote on him. You are giving 100% votes on his posts and that is affecting utopian algorithm.

I believe my voting on good content and people contributing to the platform help very much ?

Depends on the votes. In case of followbtcnews, it was harmful. It allocated extra rewards to him from utopian votes. His posts already gets high votes from utopian. If you high vote on them before the utopian vote, the bot will massively increase the sp because you have a high voting power.

We are fixing the issue soon. The bot algorithm will be updated to prevent such thing from happening.