The website has disallow rules for Yahoo Slurp bot.
https://help.yahoo.com/kb/learn-submit-website-yahoo-robotstxt-directive-sln2213.html
Robots.txt
Get access to data on 15,917,604 websites Yahoo Slurp Disallow Customers. We know of 5,127,605 live websites using Yahoo Slurp Disallow and an additional 10,789,999 sites that used Yahoo Slurp Disallow historically and 2,344,884 websites in the United States.
Get a list of 15,917,604 websites using Yahoo Slurp Disallow which includes location information, hosting data, contact details, 5,127,605 currently live websites and an additional 573,027 domains that redirect to sites in this list. 10,789,999 sites that used this technology previouslyand 2,344,884 websites in the United States currently using Yahoo Slurp Disallow.
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