that was also true of SVB
and the problem is you know nothing about the financial health of the small banks that are white label providers so how can you say you’re confident in the management of these individual banks that Mercury is contracting with? you don’t know anything about them.
so, if mercury has a 1M FDIC guaranteed, then you can move 1M per day through their systems with 100% guarantee, but the risk that a bank fails on one particular day is very small, so maybe you can move 10M a day through them, with effectively no risk.
10M a day is 3.5B a year. very few companies are doing transactions on that level, so mercury scales up very well.