A cat fountain speeds up the process by exposing more surface area to the air. Lots of cats also appreciate moving water, based on instinctual understanding of the safety of running vs stagnant water.
Also, the cat bowl tastes like cat spit and this is unacceptable. The toilet gets freshened more often.


Reminds me of a photo I took this last weekend.
Edit: Never mind, the photo keeps falling off. It’s a great blue heron in an estuary.