global function get_products() clashing with theme

I recently tried to install Klaviyo into a site with a custom theme and a global function in the theme, get_products(), clashed with the same from the plugin. I renamed the theme function to get round the issue but looking at the code in the Klaviyo plugin I was just wondering why the function hadn’t been prefixed with “kl_” as with other functions in the same file? (class-wck-api.php)