Because VCs are using investor money and their investors are looking for a return. Someone along the line will be pissed off of their investments don't pay off.

Because VCs are using investor money and their investors are looking for a return. Someone along the line will be pissed off of their investments don't pay off. Burning up $800m to subsidise an app with the justification of "market share" decades before self driving vehicles become the norm is totally fine by me, as long as it's not my money being incinerated.