I wonder how this is legal. I work for a Danish municipality and we once used WiFi tracking to help us build a better inner city. The data were wiped of any ide

I wonder how this is legal. I work for a Danish municipality and we once used WiFi tracking to help us build a better inner city. The data were wiped of any identifying features, because we really didn’t care who went were, we just wanted to track the flow of citizens in general. It was still deemed illegal under the government adapted GDPR laws because we didn’t have consent. So how on earth is London getting away with this, and I guess you could say the same about their CCTV footage?