But surely soviet style huge blocks of tiny t0 apartments all stuck together is a dream...
Public transit. Capturing enough money from fares is difficult, maybe impossible, but it's quite profitable if you can capture the value generated by the enabled economic activity and raised property values.
The same really goes for most infrastructure. There's a reason the government operates nearly all the roads. Also the fire departments and police stations
In this case what people want is the reverse. They want the government to build in Austin.
The government should be involved when market forces won't solve an issue, ie no market will make it profitable to send an ambulance to a town 3h away in the mountains. You don't need affordable housing in the center of Austin just because it's trendy though.