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You could try putting up a cloudflare proxy and Turnstile (their captcha product) to try to help with it.
The truth is, though, if it’s static content, then you have to be able to stop them every time. Once they get it once, they got it. With how frequently they can try, it’s going to be difficult to stop them.
I’d contact Ninja support about it, but the likely answer is that it’s not possible