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Those are external platforms with individual accounts and requirements (they also request more info than the Steem blockchain does). This is straight on the blockchain, so you should consider the pros of the blockchain as the pros of this messaging app:

  • append-only features (can't delete messages)
  • identity verification (can't send messages as someone else, which does happen all the time on Discord and Steemit.chat)
  • ??
  • profit

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