I often see projects like this posted on HN, and it's very unclear to me what the actual use case is. Does anyone even end up actually using these things? I g

I often see projects like this posted on HN, and it's very unclear to me what the actual use case is. Does anyone even end up actually using these things? I guess the developers hope it takes off, and they gain notoriety as 'the guy who made X'? It's unclear.