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And well, I doubt that everyone always cleans up their shower curtain properly everytime because you do not see what needs to be cleaned. I'm just saying that it take sole two minutes to hang up some towels, and I'd rather do that then having to clean a whole curtain everytime or having to buy a new one at least twice a year in order to not having to fear mold.

No. I simply lay towels around the bathtub and clean up properly after showering. Shower curtains are full of bacteria and soak up the water and start to go moudly sooner or later. Also some bathtubs have plastic doors.