Does this public-private partnership truly benefit the public?
It never does: whenever public services are delegated to private companies on the promise that they'll run them better for cheaper, it holds true for 2 or 3 years, and then the service degrades and becomes more expensive because the shareholders are greedy and they know they've captured the market.
Case in point: private highways in France that cost you a fortune, railway services in the UK that are always late or cancelled, healthcare in Finland which is even worse than the UK's despite being a Scandinavian country, and of course almost everything in the US.