But...
It doesn't negate the significant amount of data for that month, but many of our (Aussie) 'Unlimited' plans do actually come with a variety of provisos in the ultra fine print such as "Your data speed will [or MAY] drop once you reach bigly amounts [though what an actual 'bigly amount' is isn't actually defined] or if we think you are being naughty [doing commercially stuff] or running a Mega replacement site or etc etc etc"
I seem to recall a bod taking either Telstra or Optus to court over the definition issue because, well, isn't unlimited actually unlimited, m'lud?
Either way, still a bigly amount.