It's both. Bad ping however won't get you a ban, it will, at most, send you to orbit.

Bans come from reports. Reports come from visible red bars. Red bars come from bad ping times. Nobody is measuring your bulk up or down speed. Participating in a video game is not like downloading one.

Your constantly uploading and downloading while playing a game, hence why latency is measured and up and down recorded. You don't have to be reported to be looked at and banned I don't know where you got your information. Edit: Here is some proof: "The second wave is happening as we speak. As always, we start small to ensure our tools are properly calibrated, and widen the net..." -bungie They use tools to find and monitor network traffic, reports are special cases that get looked at individually after so many "strikes" come in to be viewed.