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I think it is the most probable answer. Also as writtent below, it is easy to manipulate as there is not a "real" market, low volumes

I don't get it, how is SBD used to convert BTC to USD?

On some exchanges (Bittrex for example) you cannot have EUR / USD on your account. Therefore if you want to take profits and be back in fiat you have to sell BTC to get Tether or SBD (which are supposed to be 1$). SBD started increasing since Tether has been called a scam and got stolen 30 mn.

Nice, so when Tether finally goes down SBD will go to 100$ or more :)

Coin Marketplace

STEEM 0.20
TRX 0.13
JST 0.029
BTC 65725.20
ETH 3370.19
USDT 1.00
SBD 2.63