Perhaps the proprieter - who is doing all the work themself, for free, giving it all away - is trying to cover expenses?

All books on this site are free.

... a one-woman operation that has been running for over eight years. I format every single ebook myself, as well as maintaining the website. This is a passion project that was born from a love for reading and a commitment to make free ebooks that look good and feel enjoyable to read.