Hamas has banned the digging of wells since 2021. I don’t see how they would permit the harvesting of rainwater, even if there weren’t Israeli legal regulations in place (which seem to be on par with many other countries’ laws). That plus their systematic dismantling of working water infrastructure for rocket parts has had it’s effects.
“This is Florida! The whole goddamn state is shaped like a gun! You can’t walk to your mailbox without tripping over three of them. God forbid you sell one to a cop!”