Well, the tactic worked for Oracle, and I would assume some of those lawyers landed at other SV companies. Although, to be fair to Oracle, they didn't do dark pattern stuff when I used them.
The problem for Dropbox is that social media makes these strong arm tactics harder, as the victims have an opportunity to put the company on blast publicly and trash their reputation. 20 years ago companies could do this repeatedly for a longer period of time before they’d gain a reputation for being scummy.