businesses are made up of people. no one group of people are better than the other, since tech is also businesses, people shouldn't have inflated ideas that tech is "saving the world / making it a better place and all those other businesses are bad evil doers riding on the backs of everyone else".
or
We all have to do boring, non-impactful work at some point. especially starting out. We need to work hard to get to positions that make large impacts.
or
joining a start up isn't a great financial decision unless you really believe in what they are doing
Regarding start-ups, I think Wendy is a little bit too willing to make generalizations based on her own experience. There are some exciting high-tech start-ups out there in other spaces than advertising (Perfect Day comes to mind, which is working on synthetic milk). There are definitely opportunities out there for doing rewarding work.
Besides that, I agreed with Wendy's dismal assessment of the tech giants. I find it sad that some talented engineers choose to devote their careers working for companies like Facebook.
Edit: what I would have liked/expected to read is a story of someone making the aforementioned $300k+ year, making enough, leaving and the difficulties/joys of adapting to their new life exploring what they want.