Can email? It's fundamentally the same problem with malicious actors that email admins have been trying to deal with for decades and the solutions will similar

Can email? It's fundamentally the same problem with malicious actors that email admins have been trying to deal with for decades and the solutions will similar, The days of just allowing anything to link a server to a chat/discussion network ended when eris.berkeley.edu was kicked off the early irc network(forming EFnet) and for email the authorities have accepted best effort blacklists as "enough" for dealing with shady email servers trying to federate "bad" content.