Internally, employees have begged for literally decades for an employee donation matching program (similar to Microsoft's donation matching) and have been stonewalled for years, with upper leadership not wanting to give a firm answer as to why.
Meanwhile, most of the philanthropic endeavors that Amazon does offer its employees internally are in some way otherwise related to things that Jeff has a fiduciary tie to or where doing so was politically motivated to turn a blind eye to the rapid expansion of the Downtown/SLU Seattle Campus.