Because they suck?
There is this cashline service FOC with a UOB credit card too,
which I don't use, which they send me a statement just for it that
says $0.00 every month.
So one day I had a chance to call their customer hotline, and
ask if that was really necessary to send me a blank statement month
after month despite expressing the fact I don't use or need it. To
which they replied its FOC, goddamnit I don't need them to send me
a blank statement every month to know its FOC.
At least AMEX is wise enough, they let me choose between paper
and online, or have both, and no they don't send me rubbish.