Maybe relevant, but from 2019: https://www.vox.com/the-goods/2019/4/8/18250031/book-product-placement-bulgar-connection-click-fic-shopfiction https://www.vox.co

Maybe relevant, but from 2019: https://www.vox.com/the-goods/2019/4/8/18250031/book-product-placement-bulgar-connection-click-fic-shopfiction https://www.vox.com/the-goods/2019/4/8/18250031/book-product... So from that article, not really. It wasn't really successful when it was tried. So I would guess some Authors just like doing it because of their own reasons.