Update 2022-08-13: A few months ago the app started crashing and kept crashing so I uninstalled it. Looking at the comments on Play Store, other people have had the same problem. That was on a three and a half year old phone (a Google Pixel 2). I have since uploaded to a newer phone so maybe the app would work now, but I haven’t tried. One thought I had is that maintaining this at the state level is more work than doing it at the national level, which is an unfortunate situation. Also I wonder if exposure notifications work across states currently, e.g. if someone from New York traveled to California.
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So if you’ve been hesitating and wondering “I wonder what my computer programmer and security conscious friends think about this app?” The answer is I think you should install it.
I try harder than most people to avoid installing apps on my phone. I’m wary of apps causing problems either through incompetence or malicious intent. I think the risks in this case are low (much lower than any other random app, like a game or weather app) and the potential to reduce virus spread rate exists (and I barely even go out), so it’s worth it.