I worry about the waste which can destroy habitats and soil forever. I'm not a scientist, but I know what happens if someone pours salt on a garden, or a water habitat becomes too salty. Not good. Cheap is great, but something has to be done with the waste so that it doesn't cause more environmental damage.
https://news.sky.com/story/woman-whose-allotment-was-sabotag...
https://en.wikipedia.org/wiki/Salton_Sea