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> paying with cryptocurrencies or is the content delivery based on blockchains

Both

"Because of the decentralized nature of IPFS and the STEEM blockchain, D.Tube is not able to censor videos, nor enforce guidelines. Only the users can censor it, through the power of their upvotes and downvotes."

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Videos are distributed by http://d.tube, and hosted on http://ipfs.io, so obviously that's a lie.

This was literally their description on /r/Dtube

You are probably right, their wording is pretty confusing, with that part : "[...]and the STEEM blockchain"

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