I know the UK one only collects location info when you scan a QR code at various places.The location data is probably used to track trends and hot spots so they can do targeted lockdowns and investigations if outbreaks consistently occur in certain places.
What that can do is help Track and Trace by saying who was at said venue if an infected person was also there and the potential for contaminated surfaces was about. So they can trace the person and ask what time they were at the location then contact people to see when they were there to determine if they were potentially exposed.