  With the rise of COVID-19 cases globally, many countries released digital
tools to mitigate the effects of the pandemic. In Germany the Robert Koch
Institute (RKI) published the Corona-Data-Donation-App, a virtual citizen
science (VCS) project, to establish an early warning system for the prediction
of potential COVID-19 hotspots using data from wearable devices. While work on
motivation for VCS projects in HCI often presents egoistic motives as
prevailing, there is little research on such motives in crises situations. In
this paper, we explore the socio-psychological processes and motivations to
share personal data during a pandemic. Our findings indicate that collective
motives dominated among app reviews (n=464) and in in-depth interviews (n=10).
We contribute implications for future VCS tools in times of crises that
highlight the importance of communication, transparency and responsibility.
