Nice. This is really cool. I didn't know this existed. The examples of the custom blahajes look really fun.
It's great that anyone can make a blahaj if they know how to sew well enough to do so. Despite being supposedly socialized to know how to sew, it never took, I can't sew, so I'm afraid I won't be making my own blahaj. :(
As far as giving money to billionaires, you will still have to buy fabric and materials, but I imagine it is technically possible to source those from a local craftsperson. I'm not sure how many people will do this, but I'm sure it is technically possible.