Ken here. I'm here to help. I do understand how you feel, but since this may be due to our fair use policy, yes, your speed will be throttled.
You may refer to this link if you want to learn more info about it.
then this plan is false advertisement. its plan "GO UNLI" but has limitation. if it is you fair use policy when will my speed go back to normal?? its even included in the FAQ section "stream all night or play all day!" well we cant stream or play when we want. we are not having what your plan promised.