What are the examples of successful startups that were created deliberately to 'start a startup'? I'd imagine the majority of successful startups never set out

What are the examples of successful startups that were created deliberately to 'start a startup'? I'd imagine the majority of successful startups never set out with any aspiration of becoming one. I think having that goal is poison and leads people to "playing house" and going through the motions of a successful startup without achieving the key ingredient: a product users need.