I gather that SpaceX, too, is cash flow negative and heavily invested in moonshot bets.
Meaning that, like for Elon's other companies, they might be in an incredibly vulnerable position, financially speaking. A disaster could sink the company. But simply failing to have some of these risky bets pay off could be just as damaging. For example, even if everything in the plan works on a technical level, if there isn't enough demand for Starlink's service to support the whole Starlink 2 project then that might turn the entire Starlink 2 project, including the Starship rocket they need to launch these larger satellites, into a big money loser.
Not entirely unlike how we're seeing signs that Tesla may not be a sustainable business, not necessarily because of anything fundamentally wrong with their core business, but because they made some over-aggressive assumptions about how many golden eggs their goose would lay.