You can use a nulled copy of the Elementor Pro if you just wanna test out the pro features and if your site isn't live. And when it comes to the widgets, once you deactivate or delete Elementor Pro then all-pro widgets, headers, and footers build using it will also stop working.
I tested the professional functions of Elementor Pro during the trial period. I liked it and thought I would use it all the time. But then I changed my activity. The only thing I need is to create blog posts and a social media post when I write pages. But I don't always do it myself. Sometimes, I turn to a professional web design service to make a social media post design. Experts always make it faster and more beautiful. So if you get tired of zero-copy or the Pro app, you can also contact these experts.