Remove ‘style=’ from Tag Cloud

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wp_generate_tag_cloud has a filter that allows you to edit the string input. You can use regex to find and remove the inline style:

add_filter('wp_generate_tag_cloud', 'na_tag_cloud',10,1);

function na_tag_cloud($string){
   return preg_replace("/style="font-size:.+pt;"https://wordpress.stackexchange.com/", '', $string);
}