Putting yourself in a weaker position due to your views doesn't scale and thus doesn't work. For one hero there are ten conformists at the same level of skill, waiting for him/her to leave. While it's brave, it is also pointless. The problem as you state it can be solved only by explicit consensus, being it a law or just a manifesto. Modern privacy has no professional and power-y organization under it, except for few self-distanced like GNU, FSF, etc. Moreover, by staying at google engineers who have an opinion probably can influence much more than those who left.