I don't know that we can necessarily critique the spelling of an abstract signature. I mean, mine is pretty unrecognizable as my name; if my initials were XYZ, my signature would kind of look like "xY--", with a little bump at the end that you could kind of interpret as a z.

And famously, the Disney logo looks distinctly like the signature of "Waly Gisnep." Elvis Presley's autograph looks like "Elim rules." John Lennon's looks like the autograph of someone named "Sarah Clancy." Very fittingly, Henry Ford's signature is "Hemmy Turd."

Actually, on that note and in your defense, unreadable signatures kind of seems like a requirement for terrible people. Donald Trump's signature ("Snnnn Suuuuuuugh") is up there looking uncomfortably like Benito Mussolini's "VnnnnnnnWi!," Zuck's "Mr Zz" kind of reminds me of Adolf Hitler's "by Him" signature, and while I can't read Devanagari or Cyrillic, Sundar Pichai's signature sure does call to mind Josef Stalin's.

But it's a thing for not-fascists, too. Kurt Vonnegut's signature is just a line drawing of his head with the letter "t" somewhere in his hair, Emily Dickinson's is literally just her first name, Ruth Bader Ginsburg's looks like "Puth Badu Jinobung," and Charles Dickens' signature looks like it says "Snarls Wickens" (which in hindsight would be a great band name)--and they were some of the most literate people of all time.