I work with multiple high spend/well known brand companies, and my advice at this point is to stay away.
My company works with Yahoo's tech team to integrate their technology in our platform and believe me, they are still fixing so many things. Don't believe the hype that you'll lose 40%-60% of your traffic if you don't opt into Gemini Search. The staff at YaBing are currently solely made up of Yahoo's sales team - there are no Bing reps yet to offer a rebuttal.
Stick with Google/Bing first before expanding into Yahoo. It's still too much in an infancy stage to be trusted.