Correct, but that also comes to the main reason why paying people for roof solar isn’t sustainable in the long term.
As solar panels keeps getting cheaper, more and more people will put solar on their roof. Since they get paid / reimbursed for feeding power back into the grid. And they don’t need a battery because they can just draw from the grid. This causes two problems:
During the day far more power is produced than needed, since everyone has solar on the roofs
During the night there is a lot of power draw from the grid, which cannot come from all the available roof solar.
Paying people for their roof solar is a good strategy short-term, but as more and more people have solar on the roof you cannot really keep doing that.