The website has disallow rules for DuckDuckGo bot.
https://help.duckduckgo.com/duckduckgo-help-pages/results/duckduckbot/
Robots.txt
Get access to data on 312,688 websites that are DuckDuckGo Bot Disallow Customers. We know of 228,358 live websites using DuckDuckGo Bot Disallow and an additional 84,330 sites that used DuckDuckGo Bot Disallow historically and 49,168 websites in the United States.
Get a list of 312,688 websites using DuckDuckGo Bot Disallow which includes location information, hosting data, contact details, 228,358 currently live websites and an additional 294,144 domains that redirect to sites in this list. 84,330 sites that used this technology previouslyand 49,168 websites in the United States currently using DuckDuckGo Bot Disallow.
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