Sanmay Ved, an ex-Google employee and current-Amazon employee, found that the world’s largest search engine website, Google.com, was “available” for purchase. Ved added the domain to his shopping cart and made payment. The entire purchasing process went through without any difficulty. Ved received an order cancellation email and refund from Google Domains, as Google personally owns the domain, so it can still control all purchases made through it and revoke them if needed. It is still unclear what exactly happened if it was due to a bug in Google.
Source: https://thehackernews.com/2015/10/buy-google-domain.html