Most sounds I put on this site are Creative Commons 0, except for specific items. The sounds I recorded of the NYC subway (which are attribution with specific attribution instructions). I have done this because I am a believe in creating for the Public Domain, and creating assets that promote creativity. Work together, succeed together.
I have produced a video explaining more about the sounds that I have placed here, and urge you to subscribe to my YouTube channel: https://youtu.be/iWIwyx-VNYo