Use of CloudFare Puts Bitcoin Users at Grave Risk of Exposure (2015) https://www.cryptocoinsnews.com/use-cloudfare-puts-bitcoin-users-grave-risk-exposure/
Omg, Coinbase API uses cloudflare (2016) https://community.coinbase.com/t/omg-coinbase-api-uses-cloudflare/10982
EDIT: Unlike normal HN comments, apparently URLs in text submissions are not converted to hyperlinks.