Edit: fair enough, I do not know if Amazon or Visa caved. I simply assumed Visa would. Then again it was Amazon threatening, so the only way for the world to know if Visa held on, is for Visa to hold on till Jan 19. At the moment we can assume both pulled back, or Amazon "won". Only once Jan 19 passes could we assume Amazon caved.
Edit: Amazon UK has 15 Million Prime subscribers, and visa has ~ 80% market share in UK, so I am happy to say "millions" of people would at least have to scrabble and update their purchase settings. It would be disruptive to amazon - but the total cost?
https://dontdisappoint.me.uk/resources/technology/amazon-sta...