While technically correct, I think you are dramatically overestimating the difficulty ex-googlers have in getting a new job.
People say I think, when they really mean I feel.
And how you feel has nothing to do with how others feel.
There are startups out there that see you and feel there will be great success in hiring you in a CTO role.
They don’t know that you feel like Engineer #56112. They just see a slice of Google that they can inject into their company.
Go test your think