Creating a web startup is a legitimate way of gaining assets but also one of the more risky ways of doing this. The point, which may not have been completely conveyed is that building assets is significantly easier & less risky than starting startups.

Go to school, learn something, work at interesting companies, take on responsibilities, be helpful to people, build up a network, have interesting conversations, be unique.

At some point, you'll have enough assets that a startup will just fall out of all of this diligent work.