Cloudflare employee here. When I graduated from college I left a publicly exposed box (in those days we had a flat, campus-wide /16 with no NAT'ing) server running in the basement of a dorm. I think they finally removed it and the DNS A record a year and a half later :)
When I worked for a university around 1999-2000, they assigned all computers public IP addresses and would not let me install DHCP to allocate the ones for my group. How things have changed.
