https://www.vox.com/recode/2020/5/20/21264045/apple-google-exposure-notification-contact-tracing-release

What will happen now that two massive tech companies have let their powers combine to fight the coronavirus?

The Apple-Google exposure notification tool, announced on April 10, is one step closer to being launched. The two companies released software that will help public health authorities build apps that incorporate their exposure notification tool. Apple, specifically, rolled out a software update to iOS devices that some users could download immediately. This big public unveiling raises a couple very important questions: Will any government agencies actually build those apps? And will anybody use them?