I always thought that, with Dropbox, you weren't paying so much for the tech as for the storage space. I'm on a free Dropbox plan, which is presumably using essentially the same tech as a paid plan, just with less storage.
TBF that is 3 licenses – for one license it is $35. Also quite a lot IMO: it's really just a screenshot cropping and editing tool, since macOS has a screenshot tool already.