alt Hacker NewsLibertarians don't claim that they have "the solution to the world's ills". Just that the government is causing worse problems than it solves, and generally those problems can be handled by a free market.
We're already being taxed like crazy while that money subsidizes things almost everyone disagrees with. The libertarians believe that if people weren't taxed as much they could voluntarily spend money on things that are valuable to them. Some people would donate more and others wouldn't donate at all, and that's okay. I believe we would see a lot more voluntary donations without the burden of high taxes.
Claiming "libertarians haven't solved this yet" while continuing to take everyone's money is not a fair argument.
To stay on topic, this thread is about a private individual donating to a project he supports. That's something everyone should be happy about. And he did not do it as a political statement.
Historically, donations to charities drop when tax rates go down. As a percentage of income, donations were highest when tax rates were highest.
The best example that low tax rates don't increase giving: in 2017 the TCJA reduced tax rates for most people, and increased the standard deduction (but reduced the charitable deduction). Even though they were being taxed less and had more money to donate, Americans donated several billion less to charities each year (estimates very, but they're all between $15 and $20 billion less each year).