I pursue free licensing. That does not mean, however, that your license is complete.
If you add my source to your code, you need to know whether your source can legally be distributed — and in particular that, once it is made into a product, licenses of GPL2 or later cannot be used. Checking whether your source code has any licensing problems is your responsibility and your obligation.
All content and source code on this site may be used without any restriction as long as it is not used commercially. However, when you build or distribute a product with source you copied, you must check the licenses yourself before distributing or selling it.