>The research is based on a survey of creators for thousands of Kickstarter projects between 2009 and May 2015.

From the paper:

>This suggests that the taken-for-granted assumption among scholars that entrepreneurship is best performed by teams should be reevaluated, with implications for theories of team performance and entrepreneurial strategy.

The claims in the paper are pretty limited and based on a questionably representative sample. Extrapolating to "solo founders are better" seems like a leap at this stage. The results seem interesting and worthy of further evaluation, though!