[pas]

Good points, but still, it's not consistent to use that low-bandwidth channel for wrong messages.

Sure, say that don't hoard masks, but don't say that it doesn't work anyway. Say that it would only work if everyone would use them. (Because you don't know when you are contagious anyway, so saying only sick folks should wear them is again a bad message.)

Also, saying that everyone should wear them is consistent with don't hoard them. (After all, if doesn't help you if you have masks but don't distribute them to others to protect you and "your loved ones".)