I couldn’t tell from reading the article but are all phones required to have Bluetooth now? Like is the end of dumb phones?

That means the term “war crimes” is meaningless because it would just mean war. The point of specifying some actions as war crimes is to denote things that even in war you shouldn’t do not just say that all wars are crimes

That would make every crime a war crime going back thousands of years where they would lay siege on villages until the citizens starved

Metal as a whole but especially aluminum transfers heat really well the way to stop that is to create a vacuum between the walls of the cup which costs significantly more than plastic forming, then that vacuum can be readily damaged if it’s dropped and it’s even recommended that it isn’t put through heavy dishwasher cycles which both are likely to occur. Finally you have the issue that people would just keep them for home as the double walled cups can be expensive which would mean they aren’t available in shops and thus you have to use more single use plastics. While plastic cups don’t sound great this plan would reduce overall plastic usage