The second most useful feature of Dropbox (beyond being "a folder that syncs"), gone. I'm very sad about this, even though I knew it was coming. This is literally the case of "we can't have nice things because $reasons".
The Public folder is what dragged me in fully and made me stay with Dropbox. I am their paying customer now, and this very moment, I'm considering whether I'm pissed off about the thing enough to move those few gigs of data I have with Dropbox to some self-hosted solution.
Yeah - I've got an AWS account which in months where I don't use anything except my S3 storage costs me around 90c/month - and I have a licence for Transmit which gives me almost identical folder-sync like behaviour from Mac OS. There's some useful-to-me stuff the iOS Dropbox app does, but for 90-100/year I suspect I can solve or ignore that problem...
