@Delish just want to add to what others have said, the article below explains more about rewards in the Local Guides program
Question about a Local Guides reward email? Read this first
Snippet from the article:
How do I get rewards?
Rewards are offered to Local Guides from time to time as a thank you for contributing great content on Google Maps. You may receive a reward because you’ve consistently shared high-quality contributions, reached a certain level, or often review a category related to a reward. Rewards may be offered to Local Guides in particular regions. To see where you are signed up for Local Guides, please visit your Local Guides settings