2 of my friends gave google interviews onsite. Both of them were asked questions that were stack over flow questions(mind you not geeks for geeks or leetcode). Does google just pick questions from stack overflow? One of the interviewers told my friend his previous questions were banned because someone posted it online. So, IMO this means that any online questions that were leaked by anyone have a very low chance of repeating.
Every google interviewer picks their own questions. Some are lazy about picking good ones.
There are so many google questions out there now that you simply can’t “prepare” for the exact questions. I would prepare by trying to identify patterns instead and hope things workout