The players are at fault, not the chins.
The Jagex servers are designed to handle up to 2K people on a world IF the players are spread out normally or bunched together in a relatively large area doing uncomplicated things (e.g., the Grand Exchange where players mostly just trade and maybe spam chat).
No Jagex server is designed to handle 700 or 800 or more people, with or without chins, doing complicated things in a small area such as Soul Wars or Fish Flingers.
So what do the players do? Many of them try to jam into a small part of W2 or a dedicated world, with predictable lags/crashes.
Every single one of the Super Challenges has been easy to do on less crowded worlds, but do the players learn from experience? Of course not, they blame Jagex.