Create an override function, as to bypass Freemius in some less than smart plugins.

freemius.php

<?php

declare(strict_types=1);

/**
 * Create an override function, as to bypass Freemius in stupid plugins.
 * @wordpress-muplugin
 * Plugin Name: Freemius Killer
 * Description: Global override for Freemius' "loader".
 * Version: 1.0.0
 * Author: Austin Passy
 * Author URI: https://github.com/thefrosty
 * phpcs:disable
 */

if (!\is_blog_installed()) {
    return;
}

// Create the Freemius Stub in case other plugins use their own global we need to override.
$freemius_stub = new class {

    public function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1)
    {
        return;
    }
};

/**
 * Find your plugins' Freemius global variable and assign it below.
 * This example is using Menu Image; $mi_fs found in `wp-content/plugins/menu-image/menu-image.php:147`
 */
global $mi_fs;
$mi_fs = $freemius_stub;