Acknowledgements.tex

\section*{Acknowledgments}

We thank Iftekhar Ahmed, Amin Alipour, Alex Hoffer, Michael Hilton, Sruti Ragavan, and the anonymous reviewers for their valuable comments on earlier versions of this paper.
We also thank all of our interview and survey participants, especially those who helped distribute survey links.
This research was partially supported by NSF grants CCF-1439957, CCF-1553741, CCF-1560526, and IIS-1559657.