You get “compensated for you time” not paid so with whole blood it usually only takes 10 minutes so they don’t need to pay as much. With plasma it takes closer to an hour which is why they pay more. A lot of the plasma clinics don’t actually give the plasma to people but instead make drugs from them that they sell for a huge profit
That’s why I put it in quotes sinces it’s all bullshit but it’s how’s they draw the line
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
That would make every crime a war crime going back thousands of years where they would lay siege on villages until the citizens starved
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