Oh I see..... I can take little Timmy and his mother for a scenic flight around Mt. Hotham in my private aircraft. That is perfectly legal.
However on return to Porepuncka, Little Tim is bitten by a tiger snake in his backyard.
He faces a three quarter hour wait for an ambulance to arrive followed by another three quarter hour trip to Wangaratta base hospital. That is the nearest source of anti venom and pathology services to confirm it was a Tiger, not a Brown.
When Tim is bitten, my Lycoming is still warm and I haven't tied the aircraft down. The weather is CAVOK. Wangarratta aerodrome is 25 minutes away
However flying him to hospital would be a CS Flight - I'm not authorised by CASA to make a community service flight so little Tim has to take his chances.
However it would be an allowable private flight to fly the body to the undertaker, just not if Tim is alive.