He downvotes more people so he is the biggest downvoter but downvotes with a small downvote so he can downvote more people
In this post as you can see he downvoted 216 people and I bet some of them have done nothing wrong
Just like me my content is 💯 original and even my comment's are being downvoted
And the worst thing is blocktrades is supporting this behaviour
He also makes loads of curation rewards by selfvoting his comment farm buildawhale and buildawhale receives delegations from blocktrades 😂