"unused ram is wasted ram"
the only place this adage belongs is in caching. The linux kernel will "eat all your ram" but it's in temporary disk caches that can be evicted by any application that needs that RAM at any time. (this is why if you're ever looking at memory usage on linux look for "available" memory not "free" memory). Kernels can do this, applications need to just use the correct kernel interfaces and not try to replicate this idea internally.
yeah it was a corrupted extremely high res image of a DPRK soldier, took the site down trying to process it