What are some of the more popular non-commercial cultural things you're aware of?
This could be things that once were commercialized but are now public domain, or have largely resisted commercialization to this day. In this context I mean this as aiming for profit and being sold/monetized.
Many board games, such as chess, go/baduk, backgammon, and mancala were played before capitalism or copyright were invented; and thus have always been in the public domain.
Precursors to chess date to the 700s CE, and chess was played under recognizably modern rules in the 1400s. Go may date to the 200s CE, but took its modern form in the 1500s. Backgammon-like games are known from Persia circa 800 CE, and modern backgammon from the 1600s. And mancala games are over 6000 years old.