> If a company with 25+ million in cash has to manage more than 100 accounts
These products already exist. That is why I mentioned IntraFi (https://www.intrafinetworkdeposits.com/) and MaxSafe (https://www.wintrust.com/maxsafe.html). There are standard cash management accounts, https://www.moneycrashers.com/cash-management-account/.
> But most tech CEOs/founders of tiny startups probably don't know much about finance, and I can't really blame them for just putting their cash in a large bank.
Completely agree. But this is exactly the type of area VCs should be there to assist with, even if just purely for self interest.
> There's a startup opportunity to build this product right now, a pure custodian-style cash-management "bank" for small companies.
Again, these already exist, and are literally called "cash management accounts".
Also, though, it wasn't just SMBs. Roku had nearly $500 million, a quarter of their cash, in a plain old SVB bank account!! Why they wouldn't put more of their money in 3 month TBills earning nearly 5% is beyond me.