bravely telling people ‘you’re using AI wrong.
More like telling that person they lack such a bare minimum understanding of how an LLM works that it's comical. This is as fucking stupid as somebody complaining that their band saw can't trim their fingernails.
literally the first thing that the market-leader OpenAI suggests you use it for presently
"Quiz me on vocabulary"? Oh, yeah, you know, I remember all those vocabulary quizzes I had in school that asked: "How many times does the letter 't' appear in 'platitudinous'?" Oh, wait, no, it's referring to things like meaning, usage, examples sentences, etc. – actual vocabulary questions.
I don't use LLMs since I don't find myself ever needing them, and you'll find I don't pull punches with them either, but since you're whining that the placeholder text in the input box is misleading, I used it for a vocabulary question I would otherwise use Wiktionary for:

Looks good to me, boss. Either you don't understand what quizzing someone on vocabulary means or you assume the person is in kindergarten and needs to learn how to count the number of letters in a word.