Denributed denial-of-service attacks involve a network of infected computers in sending traffic and making queries to the target host. By deploying a botnet with potentially thousands of unique devices, it is difficult to block on a per-IP basis. Without adequate protection, a DDoS attack can slow down a website or service to a crawl until it is no longer accessible. A decentralized network, users can rent out their spare bandwidth through a desktop client and earn money by sharing their bandwidth. Then their excess bandwidth is distributed to nodes which in turn funnel the bandwidth to websites under DDoS attacks to make sure they stay up.
Source: https://thehackernews.com/2017/11/gladius-ddos-protection.html