I just had this happen, and this HN post was the first result when searching "what is discover.aigc" on google. The specific Discover Feed entry that led me to see this domain (within an ERR_NAME_NOT_RESOLVED error) would've been (if the link actually worked) an Allrecipes article entitled "Over 12,000 pounds of bacon recalled" which, in my case is not not some shock-value nonsense (like I assume is the case for OP's experience) because there is, indeed, this Allrecipes article [0] along with this .gov article [1].
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I just had this happen, and this HN post was the first result when searching "what is discover.aigc" on google. The specific Discover Feed entry that led me to see this domain (within an ERR_NAME_NOT_RESOLVED error) would've been (if the link actually worked) an Allrecipes article entitled "Over 12,000 pounds of bacon recalled" which, in my case is not not some shock-value nonsense (like I assume is the case for OP's experience) because there is, indeed, this Allrecipes article [0] along with this .gov article [1].
[0] https://www.allrecipes.com/maple-leaf-foods-bacon-recall-jul...
[1] https://www.fsis.usda.gov/recalls-alerts/maple-leaf-foods-in...