Google has graciously decided that it will delete some of it tracking data after 18 months*!

* On new accounts, and only the raw data that it stores, none of the models or analysis of this data. It also make no mention how 18 month old tracking information having almost no value to them because it has already been sold and incorporated into any models they are using the data for.
You can turn this on for existing accounts, and this isn't a new thing they offer. The big thing here they are trying to push is that somehow changing the default time for when the data gets deleted is a big win for privacy.

So perhaps that first line should be:

Google decides to save money by clearing out some old archives it can no longer exploit and trying to claim it is charity.