HN commenters famously dismissed Dropbox when it was first posted. I would love to see a variant of this based on sentiment analysis and whether the conclusion would turn into "yes, but not the way you think".
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.
(I do this consistently myself.)