In the hours after some of Silicon Valley Bank’s biggest customers started pulling out their money, a WhatsApp group of startup founders who are immigrants of color ballooned to more than 1,000 members. Questions flowed as the bank’s financial status worsened. Some desperately sought advice: Could they open an account at a larger bank without a Social Security Number? Others questioned whether they had to physically be at a bank to open an account, because they're visiting parents overseas.