That's the joke [0]. But otherwise this is what I meant by "shed your expectations". Even if it were possible to prove something was not possible, how would you build it? There might be some free money in there somewhere.
I know(? it feels like I'm missing something). It is just that I feel the opposite. This is exactly the type of project that HN would like. And not heckle, because there are no similarities with the Dropbox case.
I mean, at the time of my posting this, literally every other top-level comment but two are kind of heckling the idea. I agree that a (working) project would be very interesting to the HN crowd. But it definitely also is an idea that many of those same people would have doubts about, very much like the Dropbox Show HN comment.
[0] https://news.ycombinator.com/item?id=8863