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I am developing a wordpress plugin and I’m a bit concerned if me leaving my comments will lead to someone stealing the code. The plugin depends on a backend server, but there are a few free local only operations. While `php -w filename.php` does not obfuscate the code, removing the comments could make things less obvious.
So my question is
1. Will wordpress.org accept / approve a plugin with no comments and extra white spaces? Note I will still have the header comment.

No, they won’t. Obfuscation is not allowed: “4. Code must be (mostly) human readable.” You can review the guidelines here:
https://developer.wordpress.org/plugins/wordpress-org/detailed-plugin-guidelines/#4-code-must-be-mostly-human-readable
Also, just so you know, by submitting your code to the directory, you acknowledge that you are licensing your plugin as GPL-compatible. All the code will be open-source.