I guess the argument is that Apple is a money printing machine but so is all of these other Silicon Valley companies.
The world won't go down without AWS and Azure. There are any number of hosting services that can provide similar services, even if it would require relearning, and in a worst case, people would just go back to racking servers and hiring bare-metal admins. A totally functional cloud Internet could certainly exist with Linode and Akamai, with a little Hetzner in the mix.
No businesses would go under without Meta. The world would be a better place without Meta. Like, what's the worst case scenario here? People can't log into Facebook, or use their Oculus? Oh no! What are we going to do?!
There would probably be some serious weirdness if Microsoft went under. Likely more so than Apple. But, they're at a 2.5T market cap. Perhaps they're just undervalued - it's just not cool to defend Microsoft - rather than this being a situation with Apple being overvalued.
Not saying that's necessarily a bad bet to make, and Apple obviously have a lot of leverage with supplier countries given their size, but they're extremely exposed to geopolitical risk when compared to Google or Microsoft. I guess I just think the valuation should be adjusted down for that risk a bit.