Yeah, but you're pulling that 50% number from thin air. How many companies do you think actually have 50% of their customers banked by SVB?
SVB had ~$200b in total assets, less than 1% of the total assets in banks across the U.S. alone.
There are definitely going to be indirect effects, but HN and other voices in early-stage tech are predisposed to overestimate the impact on the broader economy.