Sure, but this is a different value proposition. FB paid $1B for Instagram, which was trendy, growing fast, and already had 30 million users. FB paid $19B for Whatsapp, which was already established worldwide with ~400 million users. These acquisitions were very much in-line with FB's core product. The people saying it was risky were mostly just saying that it was a waste of money and that FB could have just beaten their competition instead of buying them.
And bringing up VR is probably not the best comparison to make- sure, Meta is a leader here, and they are competitive with their AI team too. But "I'm sure it will have huge ROI in the near future" is just saying that it hasn't paid off and they don't have an obvious path to getting there. Shoving VR and the Metaverse into everyone's face hasn't paid off for several years, and the VR segment as a whole has remained niche despite being around for decades.
This acquisition is different- AI is not Meta's core product, it's just something hot right now and CEOs are trying to figure out how to stuff it into their products and hoping they can figure out how to make money later. Plus, they paid a pretty big chunk of money for a company that does, what? Cleans data for LLM training? Meta's Llama team clearly has a good data group already. They paid for a few employees that are clearly popular amongst the executives in the tech industry, but I don't know how this will go in terms of attracting other talent. Unless Wang is bringing something secret along with him, I think this one is an overpayment- Meta will need to both figure out how AI makes them money and Wang will have to attract several billion dollars worth of talent to the team. I'm skeptical that people will talk about this the same way they will about Meta getting Yann LeCun to work for them for a lot less money.