*Looks and installs on test site*
I see what you mean at the end of the form on a post it has this link.
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Which can't be turned off, is on by default and violates the plugin rules item #10.
10. The plugin must not embed external links on the public site (like a "powered by" link) without explicitly asking the user's permission. Any such options in the plugin must default to NOT show the link.
In the future you can report violations to plugins [at] wordpress.org as that's the best way to handle these things.