Related question I'm not wrapping my head around:

How does the thing know you're a Massachusetts resident?

People who have the contact tracing setting disabled are reporting they still got the app, so the obvious answer seems not to apply.

Is it just getting installed on any device that enters MA? New England states are pretty small, and there's a lot of crossover, especially with states like Maine and New Hampshire, which wouldn't take this very well.

Or, if you have a layover at Boston's Logan airport, do you now end up with its contact tracing app?