Out of those I think Microsoft is the only one that isn’t sort of inflated. If Facebook disappears the world will hardly notice. If Apple does it’ll be hard to find a good laptop that can keep battery for 9 million years and it’ll be hard to find a “tech works out of the box so well that if you buy your grandmother/mother an iPad you’ll never need to do tech support again”, but still, it’s just a luxury brand.

If Microsoft disappeared the entire European public sector and most Enterprise companies in the world would cease to function. That being said, I would be some what comfortable owning Apple stock through the coming crash because they are likely to bounce back. I wouldn’t buy them at current market prices, but that goes for Microsoft as well. But I mainly put my investments into green energy on long term plans that tend to 4-6x the money over 7-10 years. Which isn’t where people who’d risk it with things like tech company stock are likely to gamble.

All three companies make healthy money though, as you point out, and that makes them pretty solid as far as this topic goes. I don’t even think Facebook/Meta is “inflated” in the bubble sense, I just don’t think it has a good future because legislation is coming after them big time; and unlike Microsoft and Apple, Facebook isn’t very diversified in its business models.