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.
Somewhat nuanced, but riding a bike anywhere. There have been many failed attempts to license or tax bicycles. The bicycle has been around in various forms since 1817, and in most cases, the laws on rights for cycling are as old as the corpus itself. Once you have a bike, you are as free as you dare or as free as your local independent cycling infrastructure supports.
When operated correctly, they're vastly safer. But it's still quite possible to have a double fatality from a bike/pedestrian collision at speed: cyclist goes flying; ped falls over; two brains broken. It's important for cyclists to follow traffic rules, stop at stop signs and for crosswalks, and bike on the street rather than the sidewalk in downtown areas.