ping I'm not very familiar with the internal workings of the community, so I'll address your questions about traffic and bandwidth for mirror sites. Traffic and bandwidth are expensive resources. A university can have multiple IP addresses, but its network bandwidth remains fixed, which is typical in on-campus data centers. Internet connections typically involve symmetrical upstream and downstream bandwidth. Bandwidth is a significant cost. Furthermore, the need to address network security adds to the expenses. After all, it's operating within the internet environment. The Tsinghua University open source mirror site has dedicated funding. For reference, you can look at the annual financial allocations for various public universities in China.