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.
I know, I solely use CGEO. It's awesome. I've even logged one premium cache just for the hell of it. It's just good to mention to people that there's this premium thing since people bump into it anyway.
You can go around it but it's annoying and not really intended for anyone but premium subscribers.
Premium-only caches: Find geocaches designated for Premium members only.
Premium-only caches offer VIP access to thousands of additional geocaches all around the world. Cache owners decide if their geocache pages can be seen by all members or only by Premium members.
From what I gathered is that some caches over a certain difficulty are set as "advanced caches" and don't show up in the official website or app to people without premium.
There's a specific app for that? I see people doing geo caching the same way they do that painted rock thing. Can usually find clues and riddles to find them posted on a physical message board at the community center.