You can sqeeze plenty of use from these laptops, especially the really light ones.
My gf works as an arts teacher in a primary school and needed something very small and light that she could carry every day to school.
The usage is mostly very light browsing (the school system, some Pinterest), showing the kids some reference images and the ocasional document editing and printing.
For a piece if what essentially is e-waste it handles that admirably, and because of the atom processor it sips power, which still gives it a few hours of battery life after about 10 yeas of ownership.
Tldr: Don’t underestimate how useful an old laptop running a minimal linux disto can be for a casual user.