[RndTbl] is zscaler9 a thing here?

Does anyone know of zscaler9 and its products? We are getting a large number of DNS lookup hits on our DNS server from zscaler9 sattelites / proxies. They appear to be a security provider who sits MITM to cleanse traffic for corps? Are there users of this product in MB, or Canada? Is this a big thing or a little thing? Can anything justify large quantities of DNS queries from them from all over the world? It looks like they intercept DNS and spoof with their own stuff, but if their proxies are caching shouldn't they only produce a sane/normal amount of hits?