This is exactly correct. If they could have, it would be profitable by now.
A lot of these large tech companies simply act as wealth transfer vehicles, enriching a few key players. When private, the insane valuations drive ever larger VC funding rounds with early investors cashing out with money from later rounds. Leadership teams take home millions in compensation and equity. All of them have a huge incentive to keep the fiction going.
By the time the company goes public, the last rats leave the sinking ship with public money and the company is now a zombie. Everyone left is just scavenging the scraps leftover until a few unlucky souls are left holding the bag.
The thing is I can't convince myself that this is meaningfully different than a classic ponzi scheme. I guess because they have a "product" and and a revenue stream. But their business is basically selling $1.00 for $0.90 -- no surprise that their volume is insane.