Is it bad that taking a look at the homepage: https://www.zamzar.com/

My first thought was "imagine the astonishing amount of private documents and PII you could collect and store if you ran something like this for free as a honeypot". People just blithely uploading any document from their personal data to convert to another format.

And if I would have to guess it's less technical users who aren't going to try something like opening a document in the latest Libreoffice (or gimp, etc) and then exporting it to another format, using local software on their computer, first.