The commercial internet. Every time I hear about a new LLM advancement I look at my legacy project list and do something without it just to upset people when I tell them later about how I didn’t do it in the most efficient way possible and am still happy.
The dot-com bubble burst of 2000 was 25 years ago, and that did ruin the whole internet for years, and it was caused by the stupidity of VC investment - more or less the same as the AI bubble is now. I have no doubt that the AI bubble will crash too, it's currently being propped up by the same magical thinking.