Please, stop spreading ridiculous FUD.
You can use copylefted code in your own projects without any restriction. It is only when you distribute this copylefted code (e.g., by letting users run it in your computer) that you need to publish your modifications to it. And then, this is only relevant when you have modified the copylefted code; otherwise you just need to distribute code that is public elsewhere, which is a non-issue.