From a different perspective, having worked on numerous Ruby projects for years across the private (startups to Fortune 500), nonprofit, and government sectors,

From a different perspective, having worked on numerous Ruby projects for years across the private (startups to Fortune 500), nonprofit, and government sectors, spanning many locations with worldwide team members, I don’t see where Ruby/Rails isn't at this point—it’s seemingly all-pervasive. Similar to general hiring/salary surveys, I’m not sure that the referenced index is accurate.