> The simple solution would be to test sites regularly with an unknown IP and common user agent to check that a site isn’t just showing content to Google and gi

> The simple solution would be to test sites regularly with an unknown IP and common user agent to check that a site isn’t just showing content to Google and gives real users something completely different. That would stop this. Surely Google does this, right? Given that - in theory - showing different content to Google versus non-Google should result in a penalty, anyway ...