Startup directories are used by companies to try and get initial promotion and achieve relative visibility. They are the best places to post your product/startup/app and get feedback, early adopters, and press coverage. One of the most important strategies to prove is your business concept and gaining early user traction. It is great for startup founders because it is more than likely that they do not have a lot of money nor have enough money to hire a PR agency. It is very important that to become a great entrepreneur, you have the inquisitiveness and though process to look elsewhere to get your startup up and running.
There are many platforms and website available to help startups engage with your target users and gain further product validation and reach product/market fit quickly. Utilizing startup directories can also be a great growth hacking technique for your company.