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Think about it for 2 seconds.
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There's many obvious excuses ...

Are you claiming a necessity ?

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Free use without registration -> free to anyone and anything -> easy to abuse at scale, with no way to restrict use.
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You can limit it a lot to minimize the abuse. In free entrypoint, set token and context limits to be very small. Limit to 2 prompts per IP or something every X hour. That is already a substantial limit where bypassing might not provide much benefits.
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Residential proxies are too prevalent for IP address limits to work effectively.
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Is there some public research that how often, for example, people download malware that allows this?
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You can use cookies to track usage history
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