The Flipper Zero and its success through direct crowdfunding proves that if you build it, and this next step is equally important to the first, if you build a community around it to directly market it effectively with reversible crowdfunding, you don’t have to wait for them to then come, as they’re already here, right there with you.

Flipper zero doesn't really have a competitor, aside from maybe a bunch of bulky equipment that fits on a table. Such a feature phone would be competing against iPhones/Pixels, both of which are pretty secure and have dedicated security teams. Any new product would have to compete on price/feature/reputation, which would be tough.