Google Cloud just poached a long-time Citi exec. Here's why public-cloud giants keep adding Wall Street veterans to their ranks.

· Yolande Piazza has been named Google Cloud's vice president of financial services. 
· Piazza, who spent 32 years at Citigroup, will be focused on helping Google Cloud lure more Wall Street clients onto the cloud provider's platform. 
· Providers are ramping up efforts to recruit financial firms to use the public...