I believe the 8 billion a year number includes its G-Suite products. My understanding is that GCP itself makes only around 1-2 billion a year (excluding G-Suite). That doesn't seem enough to cover the CapEx, OpEx and engineering costs they are sinking into keeping GCP running.

Only Amazon breaks out its AWS numbers completely today, but the other cloud providers bundle their cloud computing numbers together with other "cloud" numbers, so it makes it very confusing to keep track of what numbers people are talking about.