Yes, that's very true actually. I did see an interesting article on hot tubs that I found quite interesting: https://www.waterhygienecentre.com/blog/legionnaires-disease-hot-tub

Legionnaires' disease is a serious form of pneumonia caused by exposure to legionella bacteria. It can be contracted by breathing in contaminated water droplets from the environment. It would be very difficult to prevent when camping.