I'm on a limited bandwidth wifi connection. Every day around 1PM Google Play Services gets online and uses 3Mb for about 10 minutes, which severely degrades the internet for all other clients.
I set up a task & profile to prevent Play (the app) from accessing the network during the day. That didn't work - looks like Play (the service) is the real culprit. But, there's no way (it seems) to prevent a service from accessing it.
So, then I set up a rule to deny all network access between certain hours (really it needs a location in the profile