This isn't really a robot, more of just a remote-controlled boat. Still cool and a great idea for helping people who are drowning, of course. But seems misleading to call it a "robot", which (to me at least) implies some level of autonomy and more tech than you'd find in toy RC cars from 30 years ago.
The price tag also seems like the people want it to be marketed as a robot. You could strap a motor and RC controller to a floatation device and waterproof it for less than a couple hundred dollars. Why do things that are meant for safety always have to be insanely priced?
While greed is surely some of the answer, I’d imagine liability also plays a part. If your device fails to save someone, you could be a target for litigation.