Nonces are unique to each logged-in user. You can’t scrape a logged-in user’s nonces unless you have their cookies. But if you have a user’s cookies, you’ve already stolen their identity and can do whatever you want.
Nonces are meant to protect against users being tricked into doing something they didn’t mean to do, by clicking a link or submitting a form. So they, themselves, perform this action (unintentionally), not the attacker.
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