Runs on banks are nothing unusual, study the Great Depression, Great Recession, etc.
When depositors and investors lose confidence, runs happen. They want their deposits out and if you don't have liquidity as a bank to pay them out, you're F'ed! As a bank, putting all your eggs in one industry basket (i.e. Tech) and not diversifying your customer base and source(s) of funding, puts you at risk of a liquidity crisis. Banks fail. Only the strongest ones survive. It's called free market capitalism. Lots of people think tech as well as crypto (read up on Silvergate Bank) is se-y. I'm against bailouts, period.
The best banks are boring, diversified, rely on multiple sources of funding, have strong core deposits, diversify across industries, and stay away from fads like Cryto and only serving tech startups who have never learned how to make a nickel of profit.
Capitalism, folks.