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RE: Minnowbooster : The Only Promotion Bot Running its Own Infrastructure!
Steemnova is not even tied to the steem blockchain, they don't use any API at all. The others, you don't pay yet, because they have very little costs since they can use Steem as a free backend.
Steemd, Steemworld and ocdb could: Add Advertisements, Premium services or survive through tipping (donations).
Or beneficiary requirements.
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