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Just to clarify, only votes from those who delegated is counted?

And since we have to vote 50% and above, is there a min requirement on how many votes to cast a day?

And does the bot's voting weight vary according to the SP delegated by the users who voted on your content? I wasnt clear on that part. Thanks!

Yep only people who delegated to dMania can control the bot upvotes.
There isn't a minimum for dMania supporters. It only matters how dMania supporters distribute their votes. They shouldn't vote selfish, then they are fine.