It seems to me that most public courses are indeed free---free to play. That is, playing is free; it costs you the same, whether you choose to play or not. In that sense, disc golfers right when they refer to the courses and disc golf on them as free.
Admittedly, they don't exist without someone's money. From the disc golfer's point of view, that's virtually all someone else's money.
Admittedly, they don't exist without someone's money. From the disc golfer's point of view, that's virtually all someone else's money.