[saiya-jin]

Lets sum it up - you revealed a bug, and eventually reported it. Good. Showed some technical tricks and creative approach. Thank you.

Bad - amoral and most likely illegal theft of copyrighted content. "Just for fun" ain't gonna cut it. You hurt real businesses, probably because you don't give a f*ck about them, fun is more important.

Is it hard to see that this would stir some controversy to say at least?

Btw calling this "random cool idea" seems like you are proud of this and want some appreciation, hence sharing. If you would be concerned about security, you would share this bug immediately, which is definitely what you didn't do according to your own words.

Things can look significantly different from the other side. You know, the side of the rest of the world.