The website has disallow rules for DuckDuckGo bot.
https://help.duckduckgo.com/duckduckgo-help-pages/results/duckduckbot/
Robots.txt
Get access to data on 129,936 websites DuckDuckGo Bot Disallow Customers. We know of 75,835 live websites using DuckDuckGo Bot Disallow and an additional 54,101 sites that used DuckDuckGo Bot Disallow historically and 22,663 websites in the United States.
Get a list of 129,936 websites using DuckDuckGo Bot Disallow which includes location information, hosting data, contact details, 75,835 currently live websites and an additional 173,279 domains that redirect to sites in this list. 54,101 sites that used this technology previouslyand 22,663 websites in the United States currently using DuckDuckGo Bot Disallow.
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