"What's sauce for the goose is sauce for the gander" as the legal cliche goes. OpenAI cannot on the one hand claim that google did something wrong if they used their outputs as part of the bard training while simultaneously on the other hand claiming they themselves are free to use everyone on the internets content to train their model.

Either they believe that training should respect copyright (in which case they could not do what they do) or they believe that training is fair use (in which case they cannot possibly object to Google doing the same as them).