There’s definitely a demand for dedicated F-Droid repositories, especially among those who need more control over their app distribution. For instance, one of my clients from Dubai had an app which was repeatedly rejected by Google Play Store. They needed a platform where they could have complete control over their app. So, what we did was create a branded console and F-Droid client specifically for them. It was customized with their brand name, giving them and their team the ability to upload and manage their apps independently, ensuring that their users have direct access to their apps. And to be honest they are very happy untill now
See currently i just launch it to test does every person needs it, and let say if i get even low response but if i get response then i am planning to grow it with help of some people and even put some people who can manually test the app before uploading on a particular brand repo, so that they can get a secure environment, i mean to say there is a lot of room or need of it, if we try to think it as not a replacement of google play store but as a another need of some group of person or organistion. (micro niche type)
one more reason can be Customized Control for Niche Apps - Imagine an app designed for a specialized industry, like a custom CRM tool for real estate agents. Such apps might not cater to a broad audience like those on Google Play Store, but they are vital for their specific user base. Having a dedicated F-Droid repository for these niche apps ensures that they are easily accessible to the right audience without getting lost in the sea of mainstream apps.
apart from this, the thing which @HenriDellal said about newpipe is correct and also Consider a healthcare app used by clinics that needs to update its database or features immediately due to new health regulations. Waiting for app store approvals could cause significant delays. A dedicated repository allows for instant updates, ensuring that users always have the latest and most crucial information.