Not a sign of a business opportunity until you have confirmed people will pay for it. You have a long way to go until you have reached that point.
Meanwhile, develop your idea, and grow and nurture the community of interested people by communicating with them. Start a blog. Email your beta-signups. Get started in implementing your idea, in a pre-alpha version.
Keep testing for, and discovering the audience that will actually pay for the service. The minimum viable product merely creates the opportunity to then test for an audience. Minimum means just barely enough to show what's possible to the user, to test on your audience.
Meanwhile, develop your idea, and grow and nurture the community of interested people by communicating with them. Start a blog. Email your beta-signups. Get started in implementing your idea, in a pre-alpha version.
Keep testing for, and discovering the audience that will actually pay for the service. The minimum viable product merely creates the opportunity to then test for an audience. Minimum means just barely enough to show what's possible to the user, to test on your audience.