Cpt. Obvious is sure to say something like "Just buy a license bro". Though, other's could be wondering... How do I remove the expired / invalid license nag?
I recommend adding an option to remove expired / invalid license nag. You can cut (or delete) a small snippet of code from local file:
<div class="notice notice-error yoast-notice-error">
<p><?php printf( __( $message, $this->product->get_text_domain() ), $this->product->get_item_name(), $this->product->get_license_page_url(), $this->product->get_tracking_url( 'activate-license-notice' ) ); ?></p>
</div>