On a general note about this topic, don't ask Cujo how many times I've told him I'm never playing ZM again because of all the little fuckheads and kids that are online. Theoretically, the census of shitheads should have decreased with the re-opening of school, sadly it seems to be the opposite.
The other thing that happens with mic spam, that I've noticed, is when I'm on the opposite team from the spammer. If I'm human and from what I've noticed, Jojo seems to most often start her myriad of rants, bitches, raves and overall screaming when she gets turned into a zombie. I notice it when over all-speak people already zombified start bitching about her mic spam. This doesn't just apply to Jojo, it applies to all users.
Zero, is there a way for admins to hear everything said over the mic? On ZM, its not a huge priority of tactics, sometimes it's close, but that's one of the biggest ways to find a mic spammer.