The nature of the youtube problem isn't technical. Any hacker can figure out how to download a youtube video. The problem is policy. You will get thwarted, shut

The nature of the youtube problem isn't technical. Any hacker can figure out how to download a youtube video. The problem is policy. You will get thwarted, shutdown or sued. You can't build a business on top of subverting youtubes TOS. It won't work.