The website has disallow rules for DuckDuckGo bot.
https://help.duckduckgo.com/duckduckgo-help-pages/results/duckduckbot/
Robots.txt
Get access to data on 359,318 websites that are DuckDuckGo Bot Disallow Customers. We know of 268,468 live websites using DuckDuckGo Bot Disallow and an additional 90,850 sites that used DuckDuckGo Bot Disallow historically and 52,627 websites in the United States.
Get a list of 359,318 websites using DuckDuckGo Bot Disallow which includes location information, hosting data, contact details, 268,468 currently live websites and an additional 273,500 domains that redirect to sites in this list. 90,850 sites that used this technology previouslyand 52,627 websites in the United States currently using DuckDuckGo Bot Disallow.
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