Me too. The other argument, of course, is that instead of spending 10x on (taxpaying) staff and employees within the UK, in order to create a new technology that may be useful and solve other problems, they are spending 1x on Amazon. Amazon will not pay any tax within the UK, and, moreover, have motives that are arguably aligned to the detriment of the BBC.
I'm slightly sad to read about the change. In many ways, I'd rather the perl duck tape & php approach, running on real computers that the BBC owns. Maybe that officially makes me old.