Earlier quoted context omitted.
Dropbox recently had some backlash, mostly due to them updating their OSX software that installed a new file manager without the user's explicit permission. Not sure if it's related, but they've had some issues with their tech stack lately https://news.ycombinator.com/item?id=20477958
Do you genuinely think the Dropbox CTO resigned because of some complaints about an app dialog.
alternately: this was the person pushing the undesirable things, and other people pushed that person out as 'bad news', or, this person couldn't push more 'bad things' through effectively enough to his own liking and so left.