Those are some pretty terrible prices. You can share images (or anything else) publicly from Dropbox/Box/GDrive/OneDrive for a lot cheaper. Or just cut out the middleman and set up a S3 bucket for a few cents.
This is like $12 a year. I also have a dropbox account, which I hate. I also have various web storage accounts. For sharing silly daft images that have little connection to me, I use my imgz.org account all the time.
Free plans: Dropbox 2GB, OneDrive 5GB, Box 10GB, GDrive 15GB. They all let you generate public read-only links which aren't connected back to your account.