I think you’re missing the piece where “company” means any registered legal entity. This can be a single human to <= 8 employees to <= 50 employees to >= 1000.
You’re getting lost in the current context of what you assume to be SVB’s majority customer; the banger ‘unicorns’ we’ve all read about over the last decade, who would/should have this ‘treasury department’ you’re referencing.
Zoom tf out, remove SVB, and tell the guy who fixed your fucked plumbing last go around that his lack of a treasury department and/or insight into what his primary bank is doing with their deposits is a major problem and they deserve to eventually get fucked because of it. I’ll wait…