Why do kill switches when you can just hog all the work of maintaining some critical part of the infrastructure and make it’s functioning and maintenance so opaque and impenetrable that the employer can’t replace or fire you without their shit catching fire soon after.

This is literally my firm’s core business practice. We’ve been at it for so long that at this point we have to be included in competing bids because we are the only ones in the world that can do certain specific things.