If there’s something you want to create but you get demotivated when you find out a famous/impressive person is doing it too, I highly recommend you fight that feeling. I’ve seen too many instances of nothing getting shipped by said person a year later.

And more often, the idea is flawed a bit but what you discover along the way and adapt to is where the gold lies. Assume you’re both wrong in some subtle but important way that you need figure out.