What backend?
Just to be clear, the alternative website is based on the raw data provided on the police website, not the API they provide. The only backend is provided by one of the large shared hosting companies.
My point is that if only access was allowed to the raw data, then someone with a few spare hours would do this work for free. Yes the websites don’t compare, they aren’t meant to, it was just meant to be a demonstration of what can be done for little effort and expense.