When this happens, Google will send you a notification – prompting you to upgrade to Google One – its subscription-based cloud storage platform. This might seem like a lot of cloud storage space at first, but over time (years of downloading photos/documents, receiving emails (with attachments), and creating and saving Google docs and Sheets), you will eventually exhaust this free storage. I'll also be merging your post with the thread regarding Google Drive storage to keep the discussion together.When you create a Google Account, Google gives you 15GB free cloud storage to store files across Gmail, Google Drive, and Google Photos.

Note that Local Guides is a voluntary program but definitely feel free to provide any feedback that you may have, including suggestions and comments, much like your post here. Some users have received bus ticket and hotel discounts while others have gotten movie tickets. There are perks that come and go and will vary between regions.

It may say unknown promotion as the promotion no longer exist but an expiry date is likely still there. The expiry information shouldn't be new information to you as it would have been present on the page where you manage your Google Drive storage, can be found here. Initially, it was for a duration of two years, then it was reduced to one year, then subsequently it was changed to 100 GB for one year (as outlined in the post). I would like to direct you to the solution in this post. I'm not sure where you got information that you can keep 1TB drive storage as long as you remained the Local Guide level.

Google drive space promotion