It helps that the Bill and Melinda Gates Foundation has a hyper focus on outcomes and a track record of delivering. It's an example of what is possible to accomplish when philanthropy is done well.
While I can understand and in some sense agree that it's unfortunate our current best solution to tackling some of these problems is for someone with a lot of resources and no bureaucratic entanglements to focus on solving the problem once and for all. I can also recognize that few governments are capable of solving it regardless of political philosophy.
I'm more than happy to celebrate a solution that works today over a hypothetical solution that hasn't been successfully deployed yet. Maybe I'm too pragmatic.
However, The Gates Foundation tends to fund programs in developing countries where those countries's governments are not capable of funding it themselves.