My biggest problem with Unsplash is that they did not use a standard license that would easily be compatible with a Creative Commons or open source licensed work. If I incorporated images from Unsplash, suddenly I couldn't say "you're welcome to do whatever you like with my work." In fact, they used to use a CC0 license, but then changed, because other sites were copying them. As a user, this was a feature, not a bug.
I would far prefer to see the community band together and produce an image sharing website with CC0 as the default license. Creative Commons image search right now is in need of some TLC from an engaged community.