The website has disallow rules for Alexa's ia_archiver bot.
https://support.alexa.com/hc/en-us/articles/200450194-Alexa-s-Web-and-Site-Audit-Crawlers
Robots.txt
Get access to data on 2,023,666 websites Alexa Bot Disallow Customers. We know of 868,061 live websites using Alexa Bot Disallow and an additional 1,155,605 sites that used Alexa Bot Disallow historically and 400,028 websites in the United States.
Get a list of 2,023,666 websites using Alexa Bot Disallow which includes location information, hosting data, contact details, 868,061 currently live websites and an additional 319,522 domains that redirect to sites in this list. 1,155,605 sites that used this technology previouslyand 400,028 websites in the United States currently using Alexa Bot Disallow.
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