Because it still matters in many jurisdictions and you can sue someone in the US from outside it as I understand. My main example is what if Amazon doesn’t need to ask or pay you to sell your software, they can copy your 1000 hours work, rebrand it, make money using their brand. Either in the retail or cloud divisions. They do this already with permissive licensed software but at least those vendors had a choice. With no copyright and licenses there will be no choice for anyone.