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It has use for those who want an onchain stable coin.

Can you describe who they are and how HBD is helping ?

As a simple example, any voter for Hive proposals that would like to pay a stable pay rate to proposers. And vice-versa, anyone making a proposal that needs steady predictable payments to execute on their proposal.

"HBD is mostly optional. If you don't want to interact with it, just ask for your posts to be paid in Hive instead." -blocktrades

This will result in you receiving less value of reward paid out to your account as HIVE does it not? (in case of HBD being overvalued by open market)

Seems to be true - More ever, you also earn interest on HBD 😜

3% a year is better than nothing but still not worth buying at multiples of it's intended price. lol

Seems entirely optional then. I guess not if you want to use the DAO but I know of at least one DAO recipient who always immediately converts the payouts. Seems good enough for those who don't want HBD.