If the frontend had a fully generic tracker, teams wouldn't need to set up their own logging and stats systems... Which they do...
Well, obviously I can't say for sure they don't have any. I didn't look it up, and if I had I wouldn't be able to tell you. But since I didn't, I can tell you that the concept seems completely infeasible. There's too much traffic, and nowhere to put them.
Besides that, not everything is legal to log. The frontends don't know what they're seeing, though; they're generic reverse proxies. So...
If there’s one company in the world for whom bandwidth and storage are not an issue, it’s Google.