I can't be arsed to read the ToS again, but is it also forbidden to just share an account between several people?
My brother and I opened up that account six years ago and except for the times I forgot to turn my internet off to not be kicked out of games while my brother plays one we never had problems. It would be really shitty if we got into trouble for this because the account is valued somewhere between 1.500 and 4.300€ and is the most expensive thing I own except for my PC.