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<?php //* <--- Do not include this opening tag

remove_filter('pre_user_description', 'wp_filter_kses');
add_filter( 'pre_user_description', 'wp_filter_post_kses' );

<?php //* <--- Do not include this opening tag or site may implode

// Add to the allowed tags array and hook into Init
function om_monsterlinks_allowed_tags() {
	global $allowedtags;
	$allowedtags['a'] = array('style'=>array(
	    'data-optin-slug' =>  true,
	),);
}
add_action('init', 'om_monsterlinks_allowed_tags', 10);