Anecdotal evidence time. I write and self-publish my own poetry chapbooks, distributing them (via Smashwords) to places like Apple Books.
Most of the chapbooks will get downloaded from various venues once or twice a month. Except for one chapbook which averages around 10 downloads a day (7ish from Apple Books, the rest from Google Play). Given that the average print run for a traditionally published chapbook of poems is around 400 total, that is a phenomenal rate - especially as I do nothing whatsoever to promote my books.
How did this state of affairs come about? As far as I can work out, soon after I uploaded the chapbook in question Apple decided to "recommend" it for a week or so, which put it on the front page when searching their site for "poetry". And after it made the front page, it just stayed there, bobbing up and down in the top 100.
Why did this happen? I assume they chose to promote it because the chapbook's title is (unintentionally) a bit clickbait-y. Either that, or pure luck.