We’re always looking to improve the Dropbox sharing experience. The Public folder was the first sharing method we introduced, and since then, we’ve built even better ways for you to share securely and work together with your team.
As a result, we’ll soon be ending support for the Public folder. Dropbox Pro users will be able to use the Public folder until September 1, 2017. After that date the files in your Public folder will become private, and links to these files will be deactivated. Your files will remain safe in Dropbox.
If you’d like to keep sharing files in your Public folder, you can create new shared links. Just make sure to send the new URLs to your collaborators.
Double-speaking crap. They've broken literally thousands of links I've posted around the Internet since I started using Dropbox. I pay for Dropbox Pro specifically to have more space in my Public folder. And they chose to be pretty jerkish about it, to boot. Gross.