Millennials have a reputation for being low on loyalty when it comes to their employers — and it seems they are the same when it comes to their banks. Under 25s are opening multiple bank accounts and leaving old ones open, according to new research, a habit not found in older generations. Big question is what the implication is for the challenger banks that have many millenial clients, if these would do mortgages, investments and savings elsewhere , the value of a "free" current account is not a lot...