Kinda surprised they even still exist. Bought one for my mom years ago. She used it a lot but thought 10-15 bucks for an ebook was too much. So i had to download a bunch of public domain stuff for her. Kept her occupied for a good while
You can also sideload epubs, borrow books from libraries on Overdrive and read articles online, etc. It's way easier on the eyes than screens that rely on refresh rates (which also make them better to use before sleep), they have long battery life. And it's a lot lighter than carrying books around.
They have a lot of advantages over other platforms for reading.
It might depend on which part of the world they live in. In the West? Not so much. But in a third world country? It might very well be a day's work wage.