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by ffpip 1928 days ago
Bing search API terms of use do not allow caching [0].

"You must use results you obtain through the Services only in Internet Search Experiences (as defined in the use and display requirements) and must not cache or copy results. "

But they may have a special agreement in place due to the number of searches happening on DDG (100 million + daily [1]). They're larger than Bing in many countries.

[0] - https://www.microsoft.com/en-us/bing/apis/legal

[1] - https://duckduckgo.com/traffic