Yes i think SBD rating devalue due to high fall on price. Bitcoin fall half of it's high price in caparisio with Bitcoin SBD fall more.
SBD $10 to $2 which is huge.
If someone invested in bitcoin at peak. E.g $100 invested now the value of his investment is $45. But if someone invested $100 on SBD then the the value of his investment is $20.
SBD is more volatile then Bitcion. I wish SBD will become more stable in future. @exyle thank for update.