Meh

Throws corny backlink “powered by” text at bottom of forms. Better free plugins available so … “Meh!”

I could not get this plugin to work on my test site to save my life but “Powered by” links are explicitly only allowed if the user decides to enable it.

That does not seem to be the case here.

https://plugins.trac.ww.wp.xz.cn/browser/contact-form-generator/trunk/includes/display-functions.php#L713

See item #10 in the Detailed Plugin Guidelines.

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.

https://developer.ww.wp.xz.cn/plugins/wordpress-org/detailed-plugin-guidelines/

In the future you can report these violations to plugins [at] ww.wp.xz.cn but don’t in this case. I already have.