Used Books Go Social's NetGalley service. I didn't get any reviews for most of the month. Then I emailed them to ask, and got a two line review that looks like a bad ChatGPT imitation - clearly bogus and most likely written by their staff. By the end of the month, I had two more reviews. One was four stars but gushed about everything. Another was five stars. Those reviews were on NetGalley and only one (a first timer) posted a few lines on Instagram. Zero reviews with links to buy. Three reviews on NetGalley where people read for free anyway, This is a very far cry from the librarians, journalists, booksellers, book bloggers and what not you're led to believe when making the payment. The book, cover and description have consistently got good feedback and their team too didn't find any fault with them. Complete waste of money and when I asked, I was told to email people who downloaded the book myself, as though nagging reviewers results in good reviews. In comparison, I got 5 star reviews from legit buyers on Amazon who paid to buy my book and left a kind word too. No nagging needed. No clue who they are. Basically, I paid for people to download my book for free. I was told this is because they approve anyone who wants the book, whether likely to review or not just so they can claim a larger number of downloads, even if actual reviewers were hardly any and none useful. Maybe if you're in a genre like romance it works. There are books in YA/romance that had several reviews. Or if you're a big name like Cory Doctorow, etc. But as a sci-fi writer, that was a complete waste. Even when my book has excellent feedback and reviews, though few in number, it simply didn't reach enough interested readers.