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Well it isnt a public company and people do not know the financials so the $19 billion is likely a guess.

This will be no different than a centralized exchange right?

Think PayPal, banking, and Twitter combined.

That is Musk's vision. Yes still Web2 and highly centralized.

Imagine a databank he'll have on the users.

The value of that data will far exceed what he bought it for. Over 100% profit for him I reckon