Me. I was just recently curious how base64 encoded data would compress (gzip) compared to non-base64 encoded data. I tried it out on a few types of input, including random bytes. It was not, of course, 32gb, but it was large enough it could have been my nefarious plans or not-tiny collection of child porn images or whatever. It doesn't have to be huge to be important - an encrypted file listing a few hundred account numbers could be vital to a money laundering investigation or whatever.