They employ you and take all the risk away. If the idea fails, you move to a new one. If it succeeds, you get a large cut of equity.

Think about it more as an alternative to working at FAANG as it sits closer to salaried employment, but with much more tangible benefits should you succeed.

Rather than shotgun every idea that walks in the front door, studios deeply think about what will work and set off to build those ideas and staff them with good teams relevant to the problem domain.