And technically Musk was not the wealthiest man in the world when he bought Twitter, because he didn't had that much cash laying around in his bank accounts. And yet, when wanted, or more precisely put in corner to do so, he did shit 50 billions and bought it.
OpenAI is Microsoft, technical details don't matter here, only money.
Before FAANG the acronym was MAFANG, but due to too much closeness to a slang word, the political correct crowd change it to FAANG. Also, just as a side note, Microsoft is a trillion worth more than the "G" in FAANG.
The FAANG acronym was actually about growth rather than size, and their stock was performing like a tech stock for a while. But yes, they don't belong because they're actually a media "manufacturing" business, although a successful one.
