I talked with them. It’s minimal fee to set up but 3% round trip fee, half paid upon purchase and half at time of sale, assuming they don’t change the agreement before you sell.
Rolling over GBTC would make sense, but from a 0.25% etf might take far more than 12 years to pay off, if ever, because you lose 1.5% of your coins instantly.
It’s still not clear to me how they handle multisig. Do you hold 2 keys? Ie, Can you unilaterally prevent coins from moving? Can you unilaterally spend coins? If so, you’re giving away 1.5% of your coins for a very large degree of protection (and if your coins have yet to be purchased, you’re really only talking 0.5% as a 1% spread is normal on retail exchanges).
I suppose it could make sense if you can put appreciated bitcoin into your IRA and take the dollar amount contributed as a tax write off…I didn’t ask about that.