/g/'s latest community project,

a peer-to-peer chat program, has zero protection against DDoSing or spamming, and apparently someone has taken note of that recently

lel

He could have even asked the community for help.
Sorry that post made so mad. Prime example at DDoS tolerant service: wikileaks. Their system replicates the cached mesh across multiples servers, so that if one fails, the load is sent to the other backup servers, and new backup servers are spawned. And since it is a P2P system, anyone can clone it, and redeploy the system. There are more system like that, too many to count.