Imagine being extorted from 33% of what you earn and not even being allowed to spend whatever money you have left to get what you truly want. All while you see sex-havers benefiting from that money. Not only these people get to enjoy free sex, companionship and shit, but you're also supposed to finance their lifestyle, like paying for the "education" of their kids. It's cucked beyond belief.
I suppose if you enjoy your work, you can afford not to care about taxes. Most people don't like their job, though. Work is usually just a means to an end, so when you get nothing from it, it feels like slavery. The expression "wageslave" has some truth behind it.
Sometimes people say that with capitalism, you're "free to starve". Well, some people would rather starve than being cucked.