A lot of people fall into the trap of negativity = IQ. Your brain can spit out a reason that DropBox will succeed or fail, but the failure case sounds smarter.
Alternative take, people didn’t like Dropbox because it was the repackaging and close sourcing of existing solutions. It was more polished and financially successful but that doesn’t mean it was good for tech. It’s corporate software, yes it became valuable but it definitely represents an anti-user trend that actually would best have been resisted. You should never give closed source software root!
> Alternative take, people didn’t like Dropbox because it was the repackaging and close sourcing of existing solutions
It wasn't. Even the famous comment just pointed it was possible to replicate with existing tools. And apart from one person the thread was actually pretty welcoming.
That comment was just a grandfather of the very popular "Why should I use this instead of [completely different solution]?", that is also so very often also used against open source projects themselves.