Shipping containers are a huge red flag that a project is a gimmick.
People have this mistaken idea that there are a ton of shipping containers that need to be recycled (there was a brief period in the mid aughts where this may have been true). But a used shipping container is neither cheap nor a great material to build a home from.
Last I checked you could get a 20 ft container for what, 6 grand? That's 160 sq ft. And you need a foundation. And to frame inside for insulation. If you go Amish style without mains power you could finish out a kacynziski sized studio for under 20k.
People have this mistaken idea that there are a ton of shipping containers that need to be recycled (there was a brief period in the mid aughts where this may have been true). But a used shipping container is neither cheap nor a great material to build a home from.