When it happened to SBD in the distant past, it was usually started on one of the larger exchanges where someone NOT familiar with Steem/Hive simply saw "A token with low market supply that could be bought up" and suddenly it would be off to the races and the idea of the $1 peg went in the toilet. As I recall, SBD shot up to $13.50 in December 2017 after having struggled to hold $1... and it wasn't until May of 2018 it even dropped below $3.00 again.
What might be indirectly cool, though, is that it could end up pulling Hive up with it.
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RE: What is causing HBD to pump right now?