Maybe works for one small location, but that doesn't put nearly enough water in the air for common humidifier use cases of a gallon a day or more.
This seems crazy to me. I have to dehumidify my home to keep it at 35%. Humidity is a constant battle. I couldn’t imagine paying to dump water in my air and promote mold.
This is very climate dependent. New Orleans or Miami will have much more natural humidity than Boulder or even Boston in the winter.
Dry mucus membranes makes you more susceptible to a number of respiratory problems. If you have mold, everyone does to some extent, drying it out will just make the health problems worse as it aerosolizes the mold. Mold aside, for optimal health a level between 40-60% is advised. Allergy sufferers are especially sensitive to this.
Works wonders, is cheap, and easy to clean. Evaporation happens for free if you let it.