[berdon]

Yep, dropbox was a great company until it wasn't.

I made their first "unofficial" android client and they "allowed" it for a year or so up until they wanted to sue the pants off me. (see https://news.ycombinator.com/item?id=27036593)

[jakjak123]

suing sounds very extreme, but as someone who has worked on a similar service, unofficial clients are actually pretty annoying to deal with. They often end up using ancient APIs, dodgy secrets handling, we don't know what trackers they use, they do not follow our policies for usage that our official clients do. But they create a secondary community and some actually work surprisingly well for what they try to do.