Does it solve a problem for you? Is it a subset of something bigger you will face eventually anyway? Is it fun, actually? Yes, if yes to any of the above. And

Does it solve a problem for you? Is it a subset of something bigger you will face eventually anyway? Is it fun, actually? Yes, if yes to any of the above. And regardless, implementing something that's been done already gives a huge advantage over the edge-of-existence startups--because you begin with at least two data points. What worked or failed before, and your own project state. May learn more about the existing thing, and almost certainly have a clearer picture of your own relative progress.