There was a rumor that they were going to use Whisper to transcribe YouTube videos and use that for training. Since it's multimodal, incorporating video frames alongside the transcriptions could significantly enhance its performance.
But I am quite sure that if you start doing it at scale, google will notice.
You could be sneaky, but people in this business talk (since they know another good paying job is just around the corner) so It would likely come out.
Google is also owns a lot of it's own backbone, so It would be a lot easier for them to play network games.
And they could even try to be sneaky and try poisoning the data if it comes to that.
And since OpenAI konw that, since they probably have people that used to work at google at some point, they are unlikely to try.
Even less likely if Microsoft would know. MS is probably the only company that has even more layers than Oracle and they would not approve.