Microsoft is focused more on incubating OpenAI, getting a viable product to market now, and focusing on monetizing it down the road. Microsoft knows AI can complement an ad revenue model.
Google just opened up Bard to testers and I've found it to be complete garbage in comparison to what Bing Chat/GPT-4 can do. Bard was not afraid to just make up random things, that were verifiably false, and present them as fact. GPT seems to know enough to let you know when it's unsure.