It is not appropriate or ethical to steal a WordPress theme. WordPress themes are the property of the developers who create them, and taking a theme without their permission is a violation of their copyright.
Furthermore, using a stolen theme on your WordPress site can put you at risk of legal action and can damage your site’s reputation. Instead of stealing a theme, you should always purchase or download themes from a reputable source and give credit to the theme developer.
If you want to customize a WordPress theme, you should always create a child theme and make your changes there. This will ensure that your customizations are not lost when the parent theme is updated, and it is a much more ethical and legal way to modify a WordPress theme.
In short, it is never a good idea to steal a WordPress theme. Instead, you should support the WordPress community by purchasing or downloading themes from reputable sources and giving credit to the theme developers.