The definition of value may includes many things beside money.
A nicely written review on Google Maps brings fulfillment to the writer, the subject (e.g. business) may find the review useful for improvement, other users may also make use of the review for their better plannings.
If you're against Google, or any other mega corps, consider contributing to Openstreetmap, WikiMedia Commons etc. I have a habit of uploading photos (restaurants, foods, shops, tourist attractions) to WikiMedia Commons, organise them in categories and then add them to Openstreetmap nodes as tags.
A nicely written review on Google Maps brings fulfillment to the writer, the subject (e.g. business) may find the review useful for improvement, other users may also make use of the review for their better plannings.
If you're against Google, or any other mega corps, consider contributing to Openstreetmap, WikiMedia Commons etc. I have a habit of uploading photos (restaurants, foods, shops, tourist attractions) to WikiMedia Commons, organise them in categories and then add them to Openstreetmap nodes as tags.