“invest in a bank” it’s not an investment in any normal sense. These people were not equity holders of SVB. They weren’t getting any return in exchange for risk.
I would refer to my other comment. Investing in a bank always carries the risk of a bank collapse, a threat that people that are under the FDIC limit implicitly are insured against. Large stakeholders that didn't pay an asset management firm to diversify their holdings or expect their holdings to be diversified at SVB were not acting with the competence necessary for that level of investment. A bank doubling their assets over a two year time period is a clear indication that something was wrong.