So what is the definition of startup from your perspective? I mean, if I have an idea and just build it, wouldn't someone else take the idea, build it, and look

So what is the definition of startup from your perspective? I mean, if I have an idea and just build it, wouldn't someone else take the idea, build it, and look for VCs to make it profitable? In this case, isn't it better to always look for the possibility that my idea can actually catch on?