I've watched dozens of videos from the protests, and while some people are wearing masks, many do not, and of those that do, many routinely remove them - e.g. to chant, or wear them only on part of the face, or even move them to the neck or forehead for extended times. A lot of them frequently readjust them with their hands - without washing the hands of course, which kinda defeats the whole purpose. Regular masks aren't super-efficient at long-time mass close contact anyway - they are lowering risk when you are walking on the street passing another person, with contact time measuring in seconds, but I don't think they would provide significant defense when staying in close contact for hours, especially while moving around, running, chanting, etc. Even less goes for homemade cloth masks, which many are wearing, which provide even less protection than surgical ones.