Russia's invasion of Ukraine in February 2022 led Western governments to impose extensive sanctions on the Russian economy and the people who maintain the regime - the so-called oligarchs. The enforcement of these sanctions and the manoeuvres of these oligarchs to evade them have created new...

Much of today's software relies on programming code shared openly online. Yet, it is unclear why volunteer developers contribute to open-source software (OSS), a public good. We study OSS contributions of some 22,900 developers worldwide on the largest online code repository platform, GitHub,...