Does having control of the ONTs allow them to throttle traffic/abuse in a GPON/passive fiber system? I downshifted my ATT Fiber recently, I was getting a full

Does having control of the ONTs allow them to throttle traffic/abuse in a GPON/passive fiber system? I downshifted my ATT Fiber recently, I was getting a full gigabit when I was the first customer in the neighborhood but lately I couldn't do better than 700. So why pay for the full boat?