the article does mention situations where police and military would see benefit from magazine disconnect, but obviously if the gun industry wants something, like to not install the disconnect, police and military will do whatever they can to make that happen
https://en.m.wikipedia.org/wiki/Grid-tie_inverter
https://www.inverter.com/what-is-a-grid-tie-inverter
These kits absolutely can push power into the grid, usually with payment for the generation. Just because they may not be allowed where you live doesn’t mean they don’t exist.