To OP: Your passive income ideas are pretty grandiose. Those are legit startup ideas. For passive income think: solve the smallest problem possible. Simple SaaS software. A lead-gen blog (I know a guy who puts up reviews of expensive niche products and gets hundreds per month in amazon affiliate fees). Simple mobile apps? An ebook with information that people need? Find something that is ALREADY SELLING and do it better/different.
Also, think cheap marketing. SEO? Or is there a product that you could sell whose use would be inherently social? Passive income is barely a software problem-- you shouldn't be building anything super-complex. It's more a marketing problem. How do you talk about it? How do you find customers? If you can solve THAT on paper before you write a line of code, you're way ahead of most people who take a shot at this.
Also, think cheap marketing. SEO? Or is there a product that you could sell whose use would be inherently social? Passive income is barely a software problem-- you shouldn't be building anything super-complex. It's more a marketing problem. How do you talk about it? How do you find customers? If you can solve THAT on paper before you write a line of code, you're way ahead of most people who take a shot at this.