I checked all the embed parameters and documentation I could find and I do not see a way to disable the bottom footer of the views on Public.
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You can remove the 'More by this author' link if you sign in to your Tableau Public account and view the viz. You'll see an 'Edit Details' button either at the top right or next to the title of your viz at the bottom. One of the checkboxes is "Show author profile link". Uncheck that and the link will disappear.
Thank you Daniel. Very helpful.