Hard disagree.
Gambling is set up with the principal aims of a) making money off the spread and b) getting participants as "gamified" as possible with exciting events and the ability to bet lots of money.
Prediction markets are set up with the principal aim of crowdsourcing intelligence from a diverse set of minds. They can be set up by academia, think tanks, research labs, etc. And while (arguably) necessarily tied to real money, they also often limit participants and the size of bets through various mechanisms for a host of reasons (one being to make corruption non-viable as you mention).
Gambling is more often related to entertaining events like sports and national politics; prediction markets are often focused more on niche or technical outcomes though they also often expand into national politics to garner participation and scale.
Obviously any market in practice can lie somewhere in the middle. But that doesn't make the distinction any less important. They're not just the same thing.