BoredGamer has a video on YouTube where he make some guesses and reckons they might have levied 425m$ in funds already if you add in other revenues : The subscriptions for the "premium video content" which indeed are not in the tracker IIRC and payment for some of the marketing tie-ins with PC components makers.
The funding for this is never going to stop, I think, unless/until they reach a total show stopper. None of the lawsuits stuck, whales are in more than ever... 500m$ (or shy of) on their public facing tracker doesn't seem so outlandish anymore.
Yeah, this is the new Duke Nukem Forever from almost every comparable angle... Tech-chasing big personality "running" the ship, a bunch of heads-down devs in it for the stable paycheck, and a whole bunch of moronic investors who believe that "milestones" and "release targets" are more suggestion than any kind of imperative.
Difference now is thanks to the internet you can release alpha shit and people will gladly pay you for it...
If this were a boxed product like DNF I'd expect a similar outcome -- some outside publisher coming in and releasing whatever scraps of development are actually done once the CIG gravy train eventually stops. But yeah with this "early release" shit, CIG could theoretically keep this shit going forever without ever hitting gold/stable. Preeeeeetty cray.