All startup websites look the same. They all use this template because it perfectly addresses their goals (grab your attention, explain a new kind of product, convince you to sign up) while also being familiar and repeatable. That doesn't concern or surprise me.

Other kinds of web page with a standard design style include: shopfronts, forums and Q&A sites, search engine result pages, shopping carts, calendar apps, video sharing sites.

Trying to look irregular just for the sake of it is bad.