Anycast DNS is an excellent technology. But, it actually took more than 30 years to get to the level that it is today. The first documented use of anycast routing for topological load-balancing of Internet-connected services was in 1989. The technique was first formally documented in the IETF four years later in RFC 1546. Anycast DNS is a simple solution and an excellent choice to improve your uptime. Many implement it nowadays.