If worn correctly, a cloth mask is mildly effective but let's be real here for just a second: how many people on a plance are wearing them correctly? Optimistically three. Pragmatically none. They're off for meals and drinking. They're constantly being adjusted which will cause the hands (the germ petri dish) to constantly be near the eyes. It's silly and a charade on planes at this point, which, btw, have the best filtration system currently available.
Again, you are always welcome to wear yours. No one is stopping you just like no one is stopping you from driving to your destination instead either.