. . . the third book in The Strain series. Guillermo del Toro and Chuck Hogan's vampire series.
Spoilers after the Read More.
In The Night Eternal, the vampires are winning. They've driven the world into a nuclear winter where the sun only shines like two hours a day, killed all the human world leaders, and just generally taken over everything. One of the things they do is put people into concentration camp style blood farms.
There's a bit where one of the POV characters gets detained and put in a blood farm and is stunned that the people in the camp just . . . get on with their lives. Like "yeah, I give blood every five days, but life goes on." And she's stunned that humans could just live as vampire blood bags and be cool with it.
This book came out in 2011. And if it were written post-2020, I do kind of wonder if that character would be as shocked.
Personal note: There's a political edge the book definitely could have taken where people could be, like, "the main difference between then and now is the vampires that rule the world are literal rather than metaphorical." Or, "yeah, I sold my blood every week for grocery money in the before times too." But it doesn't go there.