I don't anything about Mega, but BitTorrent was not designed for stealing other's art. That's an unfair claim to make.
Yes, Napster was specifically started for sharing files people didn't have the rights to share, but I still don't think it's a fair comparison because nobody sharing files on Napster ever tried to claim it was their music they were sharing. If people were taking Metallica's music and recording their own versions of it that were 99% identical and then claiming they were the original artist, that would be a closer analogy. Napster also didn't receive the massive PR campaigns, huge institutional investment, the government blind-eye-turning, etc. that AI is enjoying today. Napster was also successfully sued for promoting copyright infringement.
Yes, Napster was specifically started for sharing files people didn't have the rights to share, but I still don't think it's a fair comparison because nobody sharing files on Napster ever tried to claim it was their music they were sharing. If people were taking Metallica's music and recording their own versions of it that were 99% identical and then claiming they were the original artist, that would be a closer analogy. Napster also didn't receive the massive PR campaigns, huge institutional investment, the government blind-eye-turning, etc. that AI is enjoying today. Napster was also successfully sued for promoting copyright infringement.