A second question is whether or not this makes up for how Bezos has gotten his money and the potential damages on society that has. If I burn down a house and then donate to the rebuilding it's still a net negative. The systems that allow people to amass this much wealth need to be looked at critically to see if they really are benefitting society or are just causing increased problems.
As a final note Bezos is getting a lot of negative attention because he's made comments before about how hard it is to get rid of his wealth while seemingly ignoring a lot of really good ways for him to do so. It took years of negative attention to get him moving on causes like this.