by Chirag Rathod on WordPress.org
Before saving any post, taxonomies are required or by default selected when editing a post.

🚀 This plugin works with “custom post”, Gutenberg (new editor), and Classic editor.
This plugin ensures that taxonomy terms, such as categories or tags, are selected before saving any post.
Or
Force the user to select the category/taxonomy/tags before saving any post, or default selected, based on plugin settings
Features
WHAT THIS PLUGIN CAN DO: