These are pretty low standards for "real changes."
You should not work at the company you are engaging in activism against. That isn't out of respect for the corporation in question, but rather for one's self. That's why the people who were truly against Google's unethical plans actually left the company. They didn't just sign some form online. They practiced what they preached. "Google shouldn't be helping the CIA murder people, and I shouldn't be working at Google."
How can one be their very best self if they are receiving relatively enormous paychecks working at a company with which they apparently fundamentally disagree on policies surrounding human rights?
How can one perform optimally at their place of employment when they are forced to cognitively take in the dissonance on a daily basis caused by the way their values clash with their employer's goals?
A "real union"? They don't need that, Google employees are making absurdly huge incomes at ridiculous starting salaries which are in no way representative of what multiple of productivity they offer the firm. They have decided their priorities supported working at an amorphous blob behemoth that cooked all their meals for them, walked their dog for them, and babysat their kids for them.
What this less-than-1%-minority in Google's employee needs to do is stop having their cake and eating it, too.