Bicycles are one of the few things I spend money on these days, but I have been lucky to get quite a few for free. For some reason people discard a lot of bicycles at my local dump. I have found some real classics to refurbish. Some I keep and some I redistributed to family and friends.
Also, the list is a bit roadie-centric. Add suspension, dropper posts and subtract “smart” indoor training, and Strava.