I haven't heard of people being forced to use PTO or make up time for inclement weather, but I'm sure it happens. Every place I've worked has basically taken the position of "if the office is open, you need to be here or use time off." Any time there is a snow storm or weather that prevents most people from safely making it to the office, the office will close and we are told to stay home, with no PTO needed. Though most people just work remotely in those cases for a day.
Guess I was thinking of the hourly people. Like a Pella or Winnebago where nothing gets produced if there is no work. The ones I know usually give you the option of PTO or unpaid with no penalties. I was either commission, which was a big fat 0 in those instances or salary which meant I was working 50-70 hours weekly anyhow so it just moved my schedule around. I went self-employed in 2002 when working from home was still kinda difficult due to the poor internet speeds.