Through a stroke of good fortune, Elon Musk’s otherwise disastrous purchase of Twitter has turned into one of the great business acquisitions of all time. Buying control of a president was a start.

Cash App has branched out from just money transfers. It now also offers: The ability for users ages 13 and up to invest money in stocks through Cash App Investing. The option to buy and sell Bitcoin.

Barclays has responded to a customer’s concern regarding a change in the interest rate on their savings account. The customer ...