Get DuckDuckGo's help tracking Onion-Location adoption
DDG has quite broad web crawls, which have been useful in other security projects like https://www.eff.org/press/releases/eff-partners-duckduckgo-enhance-secure-browsing-and-protect-user-information-web
We should try to find the right contact inside DDG to ask if they are all set up to notice which sites send Onion-Location headers, and to help us do a longitudinal adoption study over time.