Acknowledgements
Funding for this project was provided by grant DEB 1751380 from the US National Science Foundation. JH thanks the Santa Fe Institute and the Rocky Mountain Biological Laboratory for intellectual stimulus and logistic support. MB acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC), [PGSD2-517114-452018]. We are grateful to Richard Barnes, Juliette Franzman, Amos Golan, Justin Kitzes, Erica Newman, Andrew Rominger, Roya Safaeinili, and Jade Zhang for illuminating discussions.