In general, there is probably nothing malicious that someone can do with your publisher ID, but in order to create an Admob account and get a publisher ID, the user must accept the Admob Terms of Use . By providing public access to the publisher, in theory, someone could circumvent the acceptance of the Admob Terms of Service, and this could have legal consequences.
Disclaimer: I am not a lawyer, and the text written here should not be construed as legal advice and / or be used as such.
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