Any open system that becomes sufficiently popular will be attacked by spammers, malware/ransomware, black hat hackers, and DOS attacks, no exceptions. Anyone p

Any open system that becomes sufficiently popular will be attacked by spammers, malware/ransomware, black hat hackers, and DOS attacks, no exceptions. Anyone planning to implement any kind of open or federated system today needs to take note of this and bake in mitigations against it from the very first line of code.