I just learned about one, because of all this. A newer one. Gnu Taler

https://www.taler.net/en/index.html

Also, crypto, technically. Its got a lot of baggage though, and hoops and all that.

Lots of people want adjacent room lights or beyond to be on.

I turn all the lights in my house on at night, despite the savings loss, because I just prefer being able to see into other rooms. (I also use 100w-equivalent bulbs, to really boost the brightness).

Some people have fears, rational or irrational, about the dark. Children, people paranoid about someone breaking in, etc.

Some people feel pets should be able to see where they’re going.