I’m finishing some details on a house design now (International Residential Code). Anyone, anyplace, will be able to build it, and it will remain free to all. Kinda cuts out the rackets, doesn’t it. The same is being done with all kinds of machines and equipment (all kinds plus some). The effort is worldwide.
Open source houses, why not.
The problem is going to be societies that interfere with them or don’t want them.