I really don't get why anyone would want to sell their GBTC coins at current prices, to be honest... I mean they all bought in at higher prices and they are obviously investors who aren't in for the daily fluctuations, thus they most likely can afford to wait, as well.
The only reason I can see is a good arbitrage opportunity
Yeah, well... It's a one-way arbitrage to be honest... They'd be out of the GBTC system and into the regular coins. They might prefer staying in that ecosystem for some reason or just don't want to go through all that hassle for 10%...
If anything, this is bullish... Can't see anything bearish about it, really...