NIGERIA launched a $618 million fund to support tech and creative sectors for young investors who struggle to raise capital in Africa's largest economy. The fund - targeting 15 to 35-year-olds - comes at a time when there are concerns locally about the failure of U.S. startup-focused lender SVB Financial Group, which has supported startups in Nigeria. So far only Chipper Cash, a cross-border payments startup, has said it had $1 million in SVB. Some of the biggest startups, including e-commerce firm Jumia and Africa-focused fintech firm Flutterwave, told Reuters they had no exposure to the bank. Vice President Yemi Osinbajo…