One element is that the banking industry as a whole behaves pretty chaotically with 'unusual' customers.
Big wire in from a fundraising round? Account frozen. Big wire out for an acquisition? Account frozen. Bank learns your customers include cryptocurrency companies? Account frozen. Bank account balance huge relative to your business' cashflow? Account frozen. Random bank staff doesn't understand what you're doing? Account frozen.
In that kind of climate its almost inevitable that VC's would recommend a single bank known to not behave erratically for the activities that are usual for their investments.
Big wire in from a fundraising round? Account frozen. Big wire out for an acquisition? Account frozen. Bank learns your customers include cryptocurrency companies? Account frozen. Bank account balance huge relative to your business' cashflow? Account frozen. Random bank staff doesn't understand what you're doing? Account frozen.
In that kind of climate its almost inevitable that VC's would recommend a single bank known to not behave erratically for the activities that are usual for their investments.