There is an exponential aspect to doubling.
In regards to bitcoin specifically, I would suggest anywhere between 1% and 25% for someone who is a responsible grownup.. so yeah, maybe banks have to work their lil selfies up towards the higher end of the range... .. but if they are actually contemplating shitcoins or "crypto" then fuck that nonsense, I am not even sure if 1% would be tolerable for that.. maybe 0.25% at most?... or maybe up to 1% of the bitcoin amount.
Been having a hard time finding particulars such as what banks are under their purview and exactly what the term "cryptocurrencies" means to them.
Hopefully shitcoins are not on that list but even if they were I don't see institutional banks receiving capitol from national treasuries as foolish enough to do a full
coinbase.