If you are tired of making someone else rich, you could start your own business. But that’s a lot of work, and as someone who is anti-work, I don’t think that’s possible for you and your comrades. But the option is there!
What skersten did is 5/7 = 71%, as if any day you work on is totally lost to you for any other purpose.
Working 4 days a week at a stable successful company isn’t the same as starting a new business so that eventually you can work 4 days a week.