At least all countries I’ve been to have blinds on the outside. Germany and Netherlands have rolling shutters like these: https://www.rollorieper.de/images/rollladen/overview_rollladen_mobile.webp

Southern and Eastern european countries tend to have little doors on the outside like these: https://www.schneider-schoenwalde.de/fileadmin/\_processed\_/3/8/csm_moosgruene-fensterlaeden_d2513c37b0.webp which are made of wood or plastic

I have never been to poland, scandinavia or the baltics, but all countries I’ve been to have one way or another to completely block light and don’t let cats scratch the curtains