Welcome! This Discord bot was primarily made for practice, therefore it's incomplete and I will not offer any support if you decide to use it.
I am, however, happy to help you understand the code and help you learn.
I used the template provided by kkrypt0nn to have the "bare-bones" working prior to writing my own code.
The youtube cog is against YouTube's ToS, and you will likely receive a legal notice from them if you decide to run this yourself.
Code in this repository was created primarily for practice of developing using discord.py, while adding other software to it.
Using youtube_dl was the easiest solution as there were plenty of examples provided.
Additionally, the youtube_dl team (with support from EFF) has already fought a legal battle against YouTube, and have won. The reasoning for providing this code freely follows a similar mantra - it serves a legitimate purpose, but can also be abused. Therefore, I offer this for practice and educational purposes. I aim to comment the entire codebase, to help anyone using the code.
The original code written by the user kkrypt0nn is licenced under Apache License 2.0.
All code written by me, is considered to be public domain, if a licence is needed, it can be licenced under Unlicense.
I have removed the Apache licence file, as it does not apply to the entire repository. Links to both licences are included above.