I helped build Hate Speech detectors at Meta when I was there. Here are my thoughts on the roll-out of last week's changes, and where they might be difficult.
SHA256, which Dropbox uses, has around 10^77 possible hashes. That's 100 trillion quadrillion quadrillion quadrillion quadrillion possible values. So I wouldn't worry about hash collisions if I were you. If a hash collision happened easily in SHA256, that would be very big news for the security community, and much more serious services than Dropbox would be affected.
I've seen the screen on a netbook prototype and thought the color was pretty good. The truly great thing about the screen is how well it works in sunlight, though. I can't wait until I have a mobile screen I can use in the sun.