The thing about startups is once they get successful, they too can join the crowd of successful corporations that put profits over people. Amazon and Facebook were once young startups, but now you hear stories of warehouse workers in Amazon urinating in bottles to save time, or how Facebook doesn't properly protect the privacy of its users; as long as it can sell user data for money, does Facebook really care?
On the other hand, some job roles at some corporations aren't so mind numbing and horrible - it depends on the leadership and if they understand that working people too hard produces diminishing returns, burns them out, and encourages them to leave. (although I guess if you live in Japan, what I've heard of its work culture implies that no matter where you go you're stuck in that vicious cycle)
But the most successful startups can change the world; Amazon and Facebook are doing things that people demand, it's just that what they do don't come for free. They're successful because they figured out how to make a ton of money by satisfying consumer demand - and possibly also by lobbying successfully against higher (or any?) taxes even if their massive growth may contribute to local rent and land value increases which can outprice people who lived there all their lives.
Maybe your next post would address this anyway; it seems like a way to connect this post and your last post together haha