He's the world's richest man. So why do we hear so little from Bernard Arnault?

If you scroll through the first 10 or so pages of Google results for the charitable giving of the world's on- and off-again wealthiest man, Bernard Arnault, you'll find ... practically nothing. The most high-profile things that do come up when searching for evidence of the generosity of the founder and CEO of the French luxury goods behemoth LVMH look more like acts of billionaire one-upmanship. LVMH paid for the architecturally stunning Fondation Louis Vuitton museum, which showcases Arnault's collection of modern art. The rival billionaire owner of the luxury brands group Kering, Franà§ois Pinault, has his private collection of…