I haven't either but I did have to drive several miles out of my way a few months ago to get coffee filters at the only store in the state that seemed to have them in stock. I was told during checkout people were buying them in bulk to use as masks.
Or buying them in bulk... to make coffee? I'd assume that if people are working from home, they're also making coffee at home instead of getting it at work or on the way to work. And that would be a pretty reasonable explanation for shortages of filters that fit in home coffee makers.
I know my personal use of coffee filters went up about 10x during the pandemic. And no, they were not on my face.
I would think a paper filter filters a lot better than cloth at least. The problem is breathing through it of course (as opposed to around). I searched and see some projects on the internet where people are trying to use them. Seems like a worthwhile idea to me.