Your game just told me "Ponzi" isn't a word. I feel like Wordle wouldn't have done that, and anyway at least it has the courtesy to say "not in word list" which is very different from the outright lie that your game just told me.
Lots of word game dictionaries don’t contain proper nouns. Ponzi is an interesting example because it’s now used as the definitive for what it is, so words like that are hit or miss. Other examples that might or might not be in dictionaries are Kleenex, Xerox, etc.
