It yields the code not only based on your answers but on your digital footprint of the near past. That you always see green codes around you is positive in actuality (this thing is as accurate as it can get if everyone ALWAYS scanned every location in and out).
Don't shoot the messenger! I just share his experience and wording for whoever needs to see this. Passport pages could become a problem if the second wave of COVID-19 gets bad; if not, it should be alright.