I think this is very cool and a brilliant idea, there are a few of these in my area where I have borrowed and contributed books too.

I have been dropping my puzzle books [1] into many of these in my area. It is encouraging to see they are almost always gone when I return.

[1] https://www.kakurokokoro.com/

These are a great way to spread something you appreciate with the world. I once bought a stack of 30 or so well-used Calvin and Hobbes books and would regularly seed a few every now and then.

Just this morning I added several copies of books 1,2 & 3 of the Wheel Of Time series to a random Little Free Library because I had so much fun reading them and I hoped others would as well.

Hoping this continues.