How the hell does the Fractal Terra, even work, where does the airflow come from.

I see people freaking putting RTX 5080s and 9800x3Ds in it and this little case has like one additional fan placement and thats it, I heard the vent and materials used arent the best for air flow and its small as hell, there is basically no space for a CPU cooler, how, how does it work.

Isn't this basically a fire hazard the moment you put on something that actually uses this machine. Or do you all just undervolt the parts to be 75% less performant. Am I missing something