I don't agree. Mainly because I don't agree with the premise that ideas are worthless - something that is echoed around all the time. Ideas being worthless is the lazy and easy way to explain to someone why they should get feedback on their idea. The reality is ideas do have value. We've got a great idea for a new product, and we're not telling anyone about it. That's because our idea has value and we don't want anyo…
On the other hand, if your idea is controversial and potentially groundbreaking, then it will sound so insane that people will think you are crazy. So from the beginning you are firmly insured against people stealing it. This was basically Airbnb. They started out renting inflatable beds to conference attendees. Almost nobody thought they would succeed because the idea on its face sounds crazy. But the Airbnb guys kept going and their idea evolved and today they have a successful business.
That the other thing: ideas by themselves are not worth anything because there isn't a single idea out there that survives the execution phase unscathed. The vast majority of the time what happens is that people start with one idea, realize how shitty it is, and end up executing on something else to become successful. But that's just hindsight: if you had asked their pre-execution self what their idea was worth, they would probably throw out big numbers because they have not yet seen how worthless it is.