One example - Google Cloud network egress charges aren’t known until up to ~2 days after they happen. Since they can be obscenely expensive (eg $0.23/GB), they can make budget computation difficult.
I don't know for sure, but based on my knowledge as a user, I'd guess it could be something like delivering usage logs from points of presence in the CDN. PoPs can go offline regularly, they're highly dependent on other people's networks, 2 days might be the arbitrary line that has been drawn that gets enough of them in most circumstances, while not being too annoying for customers.
