Car infrastructure has always been funded out of public coffers. The personal automobile is not inherently a profitable enterprise to a country. It serves primarily as a way of improving personal mobility and thus second- and third- order economic productivity.
Subways and trains are vastly more efficient systems, but unfortunately they don't have the same military logistics benefits.
In terms of actual companies, we're seeing a bit of a renaissance with EVs because EVs are inherently simple, easy to commoditize, and don't require as significant amounts of government support. China has basically cut government backing out of their EV industry, which has led to some consolidation but somehow has not ended the price war.