Three interview limit referring to this: https://www.quora.com/How-many-times-can-you-interview-with-...

Former Principal Recruiter saying that Google has a policy where people who have interviewed onsite with engineering three times should not ever be reinterviewed, and will be blocked later in the process if they somehow get onsite again. There is some debate about whether or not this is still enforced, though: https://www.teamblind.com/article/google-interview-qvZnatoN