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Because it is traded with BTC and BTC is going down, as it is mentioned in this article.

SBD should be $1 so expected to go down to this

Coin Marketplace

STEEM 0.16
TRX 0.15
JST 0.028
BTC 56586.95
ETH 2389.49
USDT 1.00
SBD 2.34