I've just launched a free lightweight plugin for WordPress. It's called Paste As Plain Text By Default.
Login to your WordPress dashboard and search for Paste As Plain Text By Default to install the plugin or download and upload it manually here: Paste As Plain Text By Default
Activate the plugin and copy and paste text in Divi, Classic Editor, Elementor, Beaver Builder and other editors to get clean, unformatted text. This is a good way to keep your design consistent and your code clean without manually clearing the formats.