For those interested in e-books, there are thriving groups on Facebook where indy authors will post their book, or a link to said, for the purpose of garnering
reviews. Books can be had for free in practically any genre. Of course, mostly these are self published, which often means variable quality in terms of writing, editing, formatting, etc.
I run a small publishing house, and we too will provide freebies to people in expectation of a review down the line.
It is now a standard practice in the Indy/Small Publisher arena.
If anyone is interested, I have available (for free) a historical drama (about king Canute/Vikings), a steam punk alternate
history and an urban fantasy about witches and magic.
Just let me know if you want a link, and you can get the books for free. Note: These are professionally produced, not self-published...