I don't think this is the reason those companies, and even the government are buying Bitcoin. Bitcoin will not help them overcome the global instability, which is a huge issue in economics and national well-being.
The reason why they are buying Bitcoin is that they do not want to miss out. You can imagine what those companies which had the opportunity in billions of dollars when Bitcoin was below $500 could have made. That mindset is what is pushing all of them to Bitcoin. Also, as you know, individuals, companies, and even governments are copycat, they just need a few to start to encourage them, which is what is causing buying
So, it's all about FOMO, just as we also see in AI.
Greedy corporations and governments only want to get rich holding Bitcoin in the long run. They don't care about its vision for decentralizing the economy. You're right that it's all about FOMO. I mean, why would companies miss the opportunity of a lifetime to multiply their investment with Bitcoin? And governments? They wouldn't want to miss the huge taxation benefits BTC provides. It's all about money, power, and control.
Don't expect the hype to end anytime soon. Not as long as BTC remains smaller than Gold in terms of market cap. Once everyone is on-board and Bitcoin replaces Gold as the world's ideal store of value, that's when the craze will end (ultimately resulting in relatively-stable market prices). Hopefully, most of the BTC stays in the hands of the people. NOT large companies/entities or governments. Only time will tell us what will happen with it.