Sideface: There is no such thing as a free lunch - or free data.
You could argue that the Entertain 250GB plan was overpriced, compared with the "heavy user" plans of other ISPs.
True, taking in consideration just recently Vodafone increased the 150GB plan prices by 44.8% so really, they know where the money is coming from. I am surprised no one raised anything when the price increase came out, which was strange seeing all other ISPs actually brought prices down or increased allowance.
There's nothing free as insane implies.