The same way it works in every industry across the board. Networking and nepotism.

While you slave away through passion and getting skilled for the job, these are the guys schmoozing around with all the big wigs at all these companies with their prepared speeches and friendly (to them) demeanor.

And like it always happens, when they need to fill the position they pick the guy they know and like who impressed them and was good friends with guys they know are good at things, instead of the faceless resume on their desk.

Its also how Jews and Blacks always go from one hire to literally the entire department or industry.