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

- The IP should not be flagged as risky by ipdata.co. Source: 7 months ago

Now we have to pick a provider to use. I will use ipdata. Create an account on ipdata.co to get your API key. - Source: dev.to / over 1 year ago

Those IPs are likely flagged as "datacenter". And they may not be squeaky clean either. Check https://ipdata.co/ and https://scamalytics.com/ . Source: about 2 years ago

While investigating I discovered that the popular site https://www.whatismyip.com was regularly disseminating incorrect ASN data for starlink ip's. Every other site I can across had the correct data published, which led me to question just where the former site was obtaining their data. I emailed them, as well as alerting Starlink and both got back to me stating they were in contact with each other, and on it. I... Source: over 2 years ago

How do these people who provide commercial WHOIS APIs (for instance ipdata.co) get their data in the first place, and can I access it? Source: over 2 years ago