SPIEGEL: It is their money at the end of the day.

Krämer: In this case, 40 superwealthy people want to decide what their money will be used for. That runs counter to the democratically legitimate state. In the end the billionaires are indulging in hobbies that might be in the common good, but are very personal.

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"There’s nothing necessarily wrong with the American system of tax-subsidized charity, of course."

"The critique is that this system affords too much power to the rich, whose decisions may not align with what’s best for society. This is not to say that the government is a paragon of efficacy either, but it risks a lot to depend on a handful of mega-billionaires to be prudent, effective philanthropists."

"What genre of philanthropy will Chan and Zuckerberg invest in? Possibly anything. Their letter Tuesday set two missions, both ambitiously vague: “advancing human potential” and “promoting equality." They mention curing diseases, improving clean energy, promoting entrepreneurship, fighting poverty and hunger, empowering women and minorities, and so on.

The pair do not have a sterling track record when it comes to effective charity. One of their previous efforts, a high-profile $100 million donation to fix the schools in Newark, N.J., has been widely criticized as a failure.

Chan and Zuckerberg write in their announcement that they have learned from their past experiences with philanthropy. For now, they will start with their own community in San Francisco, focusing on education, health and “connecting people.”