For me, even the most minimal description is sufficient: "We're in niche X." Example: We're in cloud storage. That gives away nothing about your "secret sauce

For me, even the most minimal description is sufficient: "We're in niche X." Example: We're in cloud storage. That gives away nothing about your "secret sauce" while still providing the minimal amount of info needed for a hacker to know if they are interested in what you are building.