I don't really see anything that really matches their valuation. Yes there is some value in launching stuff in space. But it ain't not trillion.
And for starlink. There is some market. But if terrestrial options got their stuff together it is not that big either. Userbase is marginal. As they operate in areas that are not served by other options. And that market has real limit in size.
As far as I can tell it is in machines they cannot make work, servicing markets that do not exist for a service that will not matter for 20-years.
That and a third rate AI company that no body wants, except to get rid of.
This will probably go swimmingly at the start - but as time goes by and they raise more capital, Musk snorts more K and the glory fades, what then?