Fox, who also oversees Apache Maven, a popular Java build tool, explained that its repository site is at risk of being overwhelmed by constant Git pulls. The team has dug into this and found that 82 percent of the demand comes from less than 1 percent of IPs. Digging deeper, they discovered that many companies are using open source repositories as if they were content delivery networks (CDNs). So, for example, a single company might download the same code hundreds of thousands of times in a day, and the next day, and the next. This is unsustainable.

GitHub added rate limits for unauthenticated users last year

https://github.blog/changelog/2025-05-08-updated-rate-limits-for-unauthenticated-requests/