Jeff Bezos has a habit of issuing splashy philanthropic promises while offering few details. The latest: a $100 million pledge to help rebuild Maui after August’s devastating wildfires. Bezos and fiancée Lauren Sanchez have given $15.5 million over the past five months through the Bezos Maui Fund, according to a spokesperson for the billionaire. But he declined to name the recipients — and local officials and nonprofits on Hawaii’s second-biggest island are puzzled at where the money might have gone.