Words are cheap, thoughts are cheap, and voting is cheap. A full-time job, on the other hand, is a substantial contribution towards something, and it comes with a huge opportunity cost. The job you have is a major factor in determining your moral character. Determining what kind of a person you actually are, as opposed to the kind of a person you believe to be, or wish you'd be.
Extrapolating that to Meta or Google is a fundamental misunderstanding of history and insenstive.
If you decide that your work is against your values, you're also deciding to separate yourself from the group, even if you don't actually leave the company. That's painful. It's not an excuse, but it is a powerful motivator.
This is equally true for leftist projects. If one is dedicated to the cause of improving the general welfare and creating economic and social opportunities for as many as possible, that's laudable, but you can't use it as an excuse to just ignore the human rights whenever you run into a problem or a tricky ethical situation.
It’s also a little funny to turn a thread about the blatant failures of a neoliberal “success” story into a weird criticism of the left.