1. By default DDG keeps your query in URL (for example duckduckgo.com/?q=blue+widgets) so that exposes your DDG searches to Google through Chrome
2. Whatever browser you use, if anyone accessed your browsing history they would know exactly what you searched for
These can be changed in DDG settings by changing requests from GET to POST but there is probably lack of awareness among users who come to DDG because of the whole 'privacy' thing. More on DDG privacy issues https://choosetoencrypt.com/search-engines/duckduckgos-bigge...