Though Artifactory is currently still listed as being OSS on their site ( https://jfrog.com/open-source/ ) they stopped publishing the source code after the 7.0 release of Artifactory (somewhere beginning this year). I guess this could be the reason. Having an OSS product is not something investors get thrilled about...
Usually JFrog is pretty responsive on StackOverflow though for this particular question they seem a bit evasive ( https://stackoverflow.com/questions/43481238/where-is-the-ar... ).