Comment # 1 on bug 1118857 from Dominique Leuenberger

WE limit the space on the live media to 1GB.

for western europe, this might seem low, as it's hard to get a USB stick < 8GB
here nowadays - but other regions still use 1GB sticks quite a lot - at
affordable prices.

So for space constraints, this is currently not possible. The full install of
course will have da available without limitations