Google introduces auto-delete controls for Location History and activity data

You can already use your Google Account to access simple on/off controls for Location History and Web & App Activity, and if you choose-to delete all or part of that data manually. In addition to these options, we're announcing auto-delete controls that make it even easier to manage your data. Choose a time limit for how long you want your activity data to be saved-3 or 18 months-and any data older than that will be automatically deleted from your account on an ongoing basis. These controls are coming first to Location History and Web & App Activity and will roll out in the coming weeks. And now we have to assume that they will actually delete said data. Do we really have any way to check? Or due to a complete lack of oversight into the kind of data these companies store, can we only believe them on their blue eyes?