Nothing is worth $852B in that space of time unless they are printing more than half of that in cash which to be clear they are not. They are burning it at that rate. Let's be clear. It's a valuable company, a valuable product, a valuable technology. It set the trend for the next phase of computer usage. But it's not worth $852B in that span of time and when it goes public that reality will bear down on them quickly.
It's a falling knife. Don't try catch it on the way down. That valuation might be justified in another 10 years.
Falling knife or not, if you own an index fund, or if your 401k owns one, you're buying a piece of it at IPO prices. The exit scam is almost complete.