Optus generally don't provide free subscriptions to those comnpanies.
They provide free data streaming (so data from these companies is not counted against your monthly limit). However you still need to have your own personal subcriptions with each company directly (i.e. they will give you a login etc.). To access just download the relevent app and enter your own subscription details.
Just recently Optus did have a 12 month subscription offer with a specific promo but I don't think you got that?
PS Don't forget to ensure Free Media Streaming is activated on your MYACCOUT (ask live chat or login here)