It's similar to fast food itself. convenient and cheap. these days the latter is falling off the wayside (again, just like modern fast food). It was invaluable during a pandemic to help encourage social distancing, but even if it was still cheap it was bound to fall off a bit (probably not to pre-pandemic levels, but no longer record customers).
>I wonder if perhaps they are so deep into a bubble of wealth and privilege that to them, spending $50 for a (cold by the time it arrives) burger seemed reasonable.
As others have mentioned, it's more a matter that VC's aren't necessarily looking to be the next big tech company. Many are looking for a profitable IPO and then move on to the next company. Lots of problems with enabling that model to begin with, but that's a whole other bucket of worms.