Is the era of the benevolent billionaire really over?

It’s feeling like the end of an era. On May 8, Bill Gates announced plans to sunset the Gates Foundation, the standard-bearing charitable organization he started with his now ex-wife Melinda French Gates 25 years ago. The foundation is set to give away more than $200 billion over the next 20 years, including virtually all of Gates’s $112 billion fortune, before winding down in 2045. Gates revealed the plans shortly after longtime Foundation ally Warren Buffett announced he’ll be retiring from Berkshire Hathaway this year...