If you are considering a new startup idea and you think "that sounds easy, I can build it in a month", then you are most likely entering a crowded market where

If you are considering a new startup idea and you think "that sounds easy, I can build it in a month", then you are most likely entering a crowded market where your startup will not add much marginal value to the world. This is most consumer startups. If instead, your idea makes you say "That sounds hard. I'm going to have to overcome technical challenges/ accumulate domain expertise/ leap regulatory hurdles" then you are most likely breaking new ground, adding significant value to society, and creating something hard to copy. As much as I am happy for the success of the snapchats of the world (and the army of snapchat clones), I don't think the world would miss them very much if they were gone.