Took a quick glance and noticed that this article is claiming "duck.com" is owned by Google, even though it redirects to DuckDuckGo.
That domain has Namecheap's Whois Guard enabled, so there's no registrant information. However, I'm still inclined to think that it isn't Google's domain since the NS records for "duck.com" point to "nsXX.quack-dns.com"...
In December 2018, it was reported that Google transferred ownership of the domain name Duck.com to DuckDuckGo. It is not known what price, if any, DuckDuckGo paid for the domain name
That domain has Namecheap's Whois Guard enabled, so there's no registrant information. However, I'm still inclined to think that it isn't Google's domain since the NS records for "duck.com" point to "nsXX.quack-dns.com"...