You might behind a shared IP with NAT or CG-NAT that shares that limit with others, or might be fetching files from raw.githubusercontent.com as part of an update system that doesn't have access to browser credentials, or Git cloning over https:// to avoid having to unlock your SSH key every time, or cloning a Git repo with submodules that separately issue requests. An hour is a long time. Imagine if you let uBlock Origin update filter lists, then you git clone something with a few modules, and so does your coworker and now you're blocked for an entire hour.

I hit those many times when signed out just scrolling through the code. The front end must be sending off tonnes of background requests