That's great! I didn't know Cisco was using Rust, or my zeromq library! I'm not sure what they're doing with it but maybe @jedisct1 might know? That article suggested they may be at Cisco.
Nothing against Rust, really. The whole system worked wonderfully. But priorities changed before the acquisition, people left, projects were abandoned, newcomers came up with the same ideas and implemented them in a language they were familiar with.
jedisct1, are you an ex-employee of Cisco or you just know people which used to work before? Or none of ex-OpenDNS people agreed to work for Cisco, in any potential case?
Guess what: our Ukrainian office was unhappy cause I asked about that. Despite that they did some marketing for Umbrella product, on a forum.