Does the product solve a problem? If so, what is the problem? Does the problem exist for a large enough number of users? Are those users likely to be paying

Does the product solve a problem? If so, what is the problem? Does the problem exist for a large enough number of users? Are those users likely to be paying users (or a sufficient percentage of them)? Or are there other relevant revenue models that exist - hopefully the company is aware of them? The product isn't really the determination of whether the company is investment-worthy or not; it's whether the problem it is meant to address is inconvenient enough for users to WANT to get the product.