It's true that many real people which upvote don't bring rewards.
About bots with huge balances, I didn't know about them.
But my doubt is: if they have huge balances, why they should upvote a post without knowing the real content of it?
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see @wang for an example of a bot with a huge balance
Yes, but if you check he doesn't upvote anyone, just comments
Look at his wallet see those posts for curation rewards. That's because it upvotes posts.