The fake masks accumulate and concentrate particles in the users airstream. The large aerosols they do catch are dried and the contents can easily then pass through. They are not designed for viruses, and there is no strong evidence they do anything positive. I suspect they are a strong net negative.

At the very least they provide false sense of protection. If people want to be protected, they should use a real mask designed for viruses.

In situations where 100% mask compliance exits, they are still not effective.

Fort Benning: "according to Elizabeth Howe of Connecting Vets. About 640 recruits from the 30th AG Battalion and 2nd Battalion, 29th Infantry Regiment arrived at Fort Benning in May for training and were immediately tested for COVID-19. Four recruits tested positive and were removed from the group while the remaining soldiers were placed in isolation for 14 days without any training exercises. After the 14-day quarantine, they were all retested and every single one was negative. Only then did the training commence – with the full panoply of obsessive social distancing measures, including mask wearing. You can imagine that there will never be greater compliance to these rules than during military training. Yet, just eight days later, after one recruit exhibited symptoms, 142 of the trainees tested positive. That is 22% of the entire group isolated and quarantined together. As they were young, none of them were hospitalized and most were asymptomatic."

https://www.theblaze.com/horowitz-from-fort-benning-to-japan...

And then there is the psychology, which is... more troubling to say the least. To the people promoting this pseudoscience, why not wear the fake masks forever?

https://stpauls.vxcommunity.com/Issue/Us-Experiment-On-Infan...