Giving things away is a massive pain in the ass. Have you ever tried to sell things on Craigslist or Facebook? Or even give them away for free? You get all kinds of dolts with all kinds of problems and complicated ideas about when and where to meet, assuming they don't just completely flake. There's haggling and begging and bizarre, sometimes unsettling interactions. As a result, I tend to just trash things more often than not.

Buy my current neighborhood does a good job. People leave furniture and other items on the sidewalk regularly and other people take them (oftentimes seemingly instantly!). Half of my furniture is from the street, some of it very nice. And there are Facebook groups where people post stuff that's on the street, or things in their home they want to give away (though then you are back to making plans with weirdos).

The main group I use is Buy Nothing... https://www.facebook.com/BuyNothingProject/

I find a lot of their policies/moderation to be excessive, but it works.