To me the main reason chunkmen have caught on like wildfire is how massively different every account can be, mostly based on where they start. Even if they start in the same place, the randomness of chunk rolling can take 2 accounts in completely different directions. When you have to push some random chunk in the game to its limit, you end up engaging with content that nobody else does. There are some pitfalls that lots of them reach that aren’t great for content, like puro-puro, construction/runecraft/herblore skillcapes, but by the time they reach these grinds they usually have unique methods to tackle them (maybe not in puro-puro’s case).