We know so much about these problems from email spam, that I doubt that a decentralized microblogging system will ever be as overwhelmed (email still has to be backward compatible with cryptographically ignorant client software).
Besides, even with email, centralized email services that trust other centralized implementations (as well as properly administered servers that have the correct credentials, rather than blocklists) have done much to shield ordinary users from the problem, and spam is now less than 50% of all email, compared to 90% in 2009.
Abuse is a separate and tougher nut to crack, though.
Besides, even with email, centralized email services that trust other centralized implementations (as well as properly administered servers that have the correct credentials, rather than blocklists) have done much to shield ordinary users from the problem, and spam is now less than 50% of all email, compared to 90% in 2009.
Abuse is a separate and tougher nut to crack, though.