I work for one of these companies. I also have pay bills to pay. I'd like to understand what a real, good alternative is.
Frontier labs such as Google DeepMind are not just going to shutter their doors because 10% of the peons dropped their jobs. I believe, at least, that we should be demanding political accountability and safeguards for society. I only get to live once: if I am to spend it for social change, I best maximize by expected return.
And quitting a job in a capitalist society probably has negative return overall.