I think that very soon they will halt withdraws. Everyone I know already did it or is doing today. Many only had a SVB account, and need some time to open another account to transfer it. (International Startups)
You literally cannot just transfer the money anywhere if it's money meant for a business. In many countries, just transferring that money to your personal account would be illegal. And many banks won't allow you to open a business account and directly after transfer millions of funds to it, without a long process of due diligence (AML/KYC). There is also a bunch of anti-terrorism (funding) laws that might prevent things from being done in just hours, especially during the weekend as many (most?) banks are outright closed during the weekend.
They’re having one. This sale is almost certainly partially brokered by the FDIC, like Silvergate was, some big bank that can handle the outflows will probably acquire them