Letting govt agencies who don't know what they're doing go out and tender for private sector building of internet services would be a disaster; they'd be oversold six ways from Sunday. Treble the cost to build the same thing three times for the three mobile platforms? Sure. Given that 99% of the stuff is simple secure form-filling, it doesn't need to be more than a web page.
I can file my taxes or renew my driving license online. The system works.