Anonymization is really not enough. Some government force Google to anonymize the data after a certain period of time. But I am sure Google engineers are able to piece it all back together without much effort. I don't say they actually do this. They probably comply with the wishes of these governments. I'm just saying they are able to do it. I would be kind of disappointed if they couldn't. What would work better is if the data were aggregated instead of anonymized. But try explaining that to a politician though. Math is usually not something politicians are well versed in and you can pretty much forget about statistics.