It’s unfiltered fresh spring water yes, but these are still human-built fountains with a known source where the water quality is measured in regular intervals. It’s not a random stream in the woods.

Switzerand is much smaller, so we have people checking on these regularly.

I always drink from these fountains, they’re all safe except the very few that have a “not potable” sign.

I wouldn’t drink from a random stream of water in the woods.

I see. Well, anyways we also filled up from streams and waterfalls, as did other locals among us. I also filled up from streams and waterfalls in many other parts of the world--I'm am avid backpacker and I have done thois hundreds of times. I've never been sick. However, I this was always water coming down from mountain summits. I wouldn't fill up from a stream running through the middle of a cattle ranch.

I suspect that there is a difference in risk between various specific spots in Switzerland and American at large.

I’d never drink untreated water in Michigan. Michigan was a giant swamp. Near the top of a summit in Switzerland with no livestock nearby? Sure.