The installation of this app, even done with good intent, open a lot of questions on what should be possible or not to be done by government and corporations.
When you get a device with pre-installed, uninstallable, or auto-installed apps. What are the rules?
> "By enabling this service, you can be quickly notified if you’ve likely been exposed to the virus by another MassNotify user, allowing you to reduce risk to your loved ones, seek medical attention, and slow the spread in your community."
In this case it seems that the same goal could have been better achieved by SMS that do not depend on the brand of your phone. The dependency on proprietary app stores and OSs seems a risk for the continuation of a free and reliable communications.
The only thing that is impossible to achieve without an app is to allow the user to select contacts to whom send a notification. Corporations like Google, and Apple know the list of all your contacts. So, it seems that the intention of the app is to reduce friction and send notifications as easy and effortlessly as possible to avoid that procrastination causes people to delay the warning.
But, instead of the silent install the government could have spend money in advertisement campaigns to assure a correct amount of installations. It costs money, but, people pay taxes so the government can engage on this type of initiative at a scale. This could have been a very good alternative, even if it means increasing the budged. Medical emergencies are worth the investing.