Where it goes after it's used is the problem.

Oil is mainly carbon, the carbon isn't destroyed by burning it. It just changes form. But now it's in the atmosphere instead of inside the earth. That's still a problem.

It’s infused with biocide and other chemicals which can’t be separated by processing plants. It’s not evaporated, but dumped if the system is open loop.

It becomes unusable for consumption and farming. It becomes waste.

Closed loop systems and ordinary humidifying doesn’t and can’t “use” that amount of water.

Thankfully weather is famously static and acutely local.

I mean, who has ever seen a cloud move?