Notice the IMO poor behavior of the author on the previous thread. [1] Search for 'philjohnson'. This post removes the contentious word "free" but still does not convey that no sign-up is required but you are apparently limited to 3 files without signup. Reading the previous thread was a turn-off enough for me to warn you.
[1]: https://news.ycombinator.com/item?id=47555636