That's surprising because Googlebot publishes IP ranges for its crawlers and it's fairly simple to block fake crawlers these days (super easy through Cloudflare, for example).
In my experience 12ft.io was pretty much useless after a honeymoon period of a few months when it first came out so I wouldn't be surprised. The Googlebot method used to work with almost everything but at some point major news orgs caught on in quick succession and I gave up even bothering to try it.
Which is something that shouldn't work. Google used to require sites to show the same thing to Googlebot and normal users; cloaking used to be banned. Were Google still enforcing that rule, these sites would have been removed from its index.