Every single business doing really good needs to take great attention to security (as well to other areas). But, if you are a startup, just starting I mean, I

Every single business doing really good needs to take great attention to security (as well to other areas). But, if you are a startup, just starting I mean, I don't think you need to be a security guru at all. Whatsapp started sending messages in plain text and look how many users they got. That's because users didn't matter about security until the company was so big that security became a real threat.