While 3 for free might help SOME users, be aware there are higher tariffs for the other 21 hours a day, including the peak hours that usually seem most usage, early mornings before work, and evenings.
Going onto TOU tariff vs old single rate is really dodgy for many, let alone the 3 for free high peak / shoulder tariffs.
As well as that, the daily supply charge is higher too for the 3 for free offers, so do some basic math based on your bills and data for how much you can use and save in the 3 free hours, because many are going to be paying a lot more with these new govco forced offers.