Net metering is effectively a subsidy for solar for customers with solar once you take into account things like the cost of maintaining the grid, and will become more and more of one as tech improvements and economies of scale drive down the cost of utility-scale solar and the actual free-market price of power at peak solar times compared to the rest of the day.
Eventually that's true. However, we have yet to hit that point as solar is still a small fraction of electricity production in the US and the daytime peak is huge.
