[jebeng]

How is this realizing microtransactions in a decentralized manner?

Having to pay a few cents in transaction fees to get a transaction included on the Bitcoin blockchain does not seem like a great platform for true microtransactions(say <$1).

21 offers their own microtransaction service, but that's just a centralized shared wallet/ledger that offers nothing new. There are multiple centralized services where you can send someone else bitcoin.

The only thing that has potential is payment channels, but I'm not sure how they are going to be implemented in a way that bypasses the Bitcoin blockchain's miner fee.