Steady demand (ie gamers) is good for making investments into the future. A massive flood of temporary demand (ie crypto) is dangerous. If they make huge investments to be able to meet crypto demand and it disappears in two years, then the manufacturers are overextended (probably on loans); they might go under when the flood abates or they might drive prices down to levels which cannot sustain future investment. The flood of crypto demand also harms their steady market of gamers: witness how much resentment has been expressed toward crypto and Nvidia in this thread.