As I responded to a comment just below this one, somebody over on reddit tested different user agents: https://www.reddit.com/r/google/comments/btysl9/google_ha

As I responded to a comment just below this one, somebody over on reddit tested different user agents: https://www.reddit.com/r/google/comments/btysl9/google_have_.. https://www.reddit.com/r/google/comments/btysl9/google_have_.... It seems pretty clear from the fact that nonsense user agents like "TotallyNotMicrosoft" and "IE6" worked, that there is a blacklist, not a whitelist.