Custodians even when fully backed can have other liabilities and they can freeze customer funds at any moment. So come forward telling us how many accounts with non zero amounts you have frozen this month. How many transactions you have stopped going out and how many transactions you have reversed for AML risk. Then tell us the total amount of coins involved and average/median amounts. Then tell us about other liabilities your company has and we talk. Else keep silent. You are downplaying the custodian risk because it benefits your state licenced business.