It's is going to be very difficult to justify this license for a project that is a ' Cross-platform Rust rewrite of the GNU coreutils'. Rewriting GPL-licensed GNU software while dropping the GPL license? To be on the safe side, one should assume that thise coreutils rewrite is concealed GPL.
If your code does not copy any copyrightable expression from mine it is not a derivative work, so if I sue you (legitimately, not because I just hope a lawsuit will intimidate you into agreeing to my demands) it means I've found things in your work that I think are copies of copyrightable things from my work.
If you haven't done a clean-room implementation your defense is probably going to rely on finding those things in other works besides mine and using one or more of these arguments: (1) these things are widely used and known and your copied yours from somewhere other than my work, (2) the ones in my work are just copies from those other works so I don't have any copyright on them for you to infringe, and (3) there are so few reasonably ways to do these things that everyone who writes them comes up with nearly identical solutions and that's why yours are similar to mine.
If you have done a clean-room implementation and kept good records to prove that, your defense is that you never saw any of my copyrightable expression so cannot possibly have copied.