Typical lazy pilots.,
: couldn't be bothered to do a 3D plot of 52 cranes
every time they get a YSSY location briefing.
It's
only 1 NOTAM out of 37 (or 133 if you include the Head Office crud)
To be slightly fair, YSSY does have helicopters and there are 3 cranes between 620' and 830' AGL.