"35% of the US stock market is held up by five or six companies buying GPUs." Ed Zitron, The Hater's Guide to the AI Bubble

Ed Zitron's Where's Your Ed At

The Hater's Guide To The AI Bubble

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So ARPANET had a famous "Flag Day" where they switched over to TCP/IP in 1983; it required a simultaneous switchover of all host machines to the new protocol. And I know that "flag day" has since referred to big changes like that in networked systems. I assumed the name referred to some bitwise flags set in packet headers. Turns out, the term comes from Multics, when similar coordination was required for an encoding change. It happened on actual US Flag Day 1966!

Flag day (computing) - Wikipedia