Please don't do this. You are not actually solving any problems with this change. You are simply making it more difficult for users to backup/sync their photos.
I use this daily. I am a big fan of Google Photos currently but that may quickly change if this is implemented. I currently use rclone on Linux to backup my Google Photos. It is great and I can modify or delete my photos from any device within Google Photos and then have the changes synced to my desktop and backup service. What you are doing will make it a lot more difficult to backup my pictures or keep a copy saved locally.
I use this daily. I am a big fan of Google Photos currently but that may quickly change if this is implemented. I currently use rclone on Linux to backup my Google Photos. It is great and I can modify or delete my photos from any device within Google Photos and then have the changes synced to my desktop and backup service. What you are doing will make it a lot more difficult to backup my pictures or keep a copy saved locally.