A couple of others I can think of:
- Crypto-boom of 2016ish: GPUs/mining rigs
- LLM/AI hype nowish: User generated data
- 90’s dotcom bubble: Server space
No, hand made masks. Especially when it surprises the officials who should have known it was possible and beefed up supplies of the real thing. The first few months of Covid were a wild ride on knowing what would be the best choices of DIY protection, and Etsy and other sites were crazy.
I 3D printed a few dozen of these visor things for my local hospital that took 3 ring binder dividers as face shields/sneeze guards. Several ended up multi-colored because I used the ends of several spools of filament for that.