jack's ideas aren't completely his though. He also copied them from those "meme websites". So basically nobody is dishonest.
As long as it's not a repost, everything is fine according to the unwritten rules of the Internet
Ok a small correction. He adapted the idea into a more original-ish creation. But to say that he came with the original joke couldn't be any further from the truth.
It's like the Netflix adaptation meme. It's something new as design but based on something that already exists