That sometimes might be a case when your Magento content managers use the same images with assigning them to different products - and that may consume a lot of priceless server media storage. Especially if you're on a big number of SKUs, that'll become a real issue.
Our small extension helps to discover such duplicates in products' galleries, remove them and point the images to original path.
That's easy - bin/magento catalog:images:remove-duplicates
Possible options:
--dry-run- performs dry running without any operations with database
Warning
Please create dumps of below listed tables, for being able to revert changes if something goes wrong.
- catalog_product_entity_media_gallery
- catalog_product_entity_varchar