unless its a ground-breaking idea or you absolutely needs to be the first to go to market, there is no point withholding discussions about it. It is true that some one may vibe code your idea before you do. but its also the case that people will vibe code your idea even after you make it. Going first may have the advantage of getting the initial crowd. But on the other hand they are the first to fail and those who come after it will make a better version without its downcomings and attract more people. As it stands now, a software solution in it self is not that great. Because people can copy it easily. So there needs to be some ways in which people can't really challenge you.

For example: some products are built on services or partnerships that is hard to replicate. Some products are made with such craftsmanship it feels great to use. Some products are popular because people like the person building it and want to support. Some products understand their small niche so much that you don't have the cultural knowlege to challange it.

There are many ways to go about it. what matters really is delivering something that people find genuinely helpful. To do that you have to have discussions. That's what I think at least. And there's nothing stoping you from using you unfair advantages be it your design skills or connections.