Based on our record, Sift should be more popular than Neustar. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
(See screenshot for clarification) The destination IP is 37.209.194.13 and query is ultradns.biz. Than Unbound tries to contact pdns196.ultradns.biz. After this Unbound tries to contact 156.154.124.65 and than 37.209.194.13 again in a loop. I whoised and looked up these and they seem to belong to godaddy registrar and neustar.biz. I don't know these and never visited them. Source: about 1 year ago
They may be using something like Sift for security checking and something of yours was flagged. Source: over 1 year ago
But sorry to break it to you, this has been done at a really large scale already although most consumers are not aware. One big player here is https://sift.com/ Almost every major retailer uses their service exactly for the reasons you mention. Source: almost 3 years ago
Reddit, for one. A pretty big list on their homepage. Source: almost 3 years ago
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