Edit: Uh okay, if it's not user traffic then why wasn't the "don't background refresh" not an option?
Doing shallow clones, which are significantly cheaper.
Google is DDoSing them, by their service design. Why a full git clone, why not shallow? Why do they need to do a full git clone of a repository up to a hundred times an hour. It doesn't need that frequency of a refresh.
The likely answer is that the shared state to handle this isn't a trivial addition, it's a lot simpler to just build nodes that only maintain their own state. Instead of doing it on one node and sharing that state across the service, just have every node or small cluster of nodes do its own thing. You don't need to build shared state to run the service, so why bother? That's just needless complexity after all, and all you're costing is bandwidth, right?
That's barely okay laziness when you're interacting with your own stuff and have your own responsibility for scaling and consequences. Google notoriously doesn't let engineers know the cost of what they run, because engineers will over-optimise on the wrong things, but that also teaches them not to pay attention to things like the costs they inflict on other people.
It's unacceptable to act in this kind of fashion when you're accessing third parties. You have a responsibility as a consumer to consume in a sensible and considered fashion. Avoiding this means you're just not costing yourself money through your laziness, you're costing other people who don't have stupid deep pockets like Google.
This is just another way in which operating at big-tech-money scales blinds you to basic good practice (I say this as someone who has spent over a decade now working for big tech companies...)
Huh? I left a few months ago but there was a widely used and well known page for converting between various costs (compute, memory, engineer time, etc).
Thats a DDoS.