Well, I think you are all wrong. When I got my CASA UOC the definition of ground level is height above any obstruction within 600m of the aircraft. This means 400ft above com towers, tree tops, building terrain, anything, but only within 600m of the aircraft.
This should not pose any issues with other aircraft as you we required to stay 1000m clear at all times, so if they fly over a tall tower at 500ft above the terrain but not increase altitude to clear a tower by the min 500ft altitude you should already be on the ground.
Of course you would have made a mandatory air and VHF broadcast prior so any aircraft within 10nm will know you are there.
Then again if your not licensed you just do whatever since your not trained and have no idea if you flying in restricted airspace, danger zones, controlled class c or within 3nm of ANY take off or landing point (including helipads which are everywhere, grass airstrips, registered and unregistered aerodromes).
The safe to fly app is rubbish, you need oz runways and access to VTC and VNC charts for proper definition of airspace categories, correct VHF freq. and populous areas.
CASA are relaxing the rules in a few weeks or months (who knows with them), which is not going to help anyone since the main change is to let unlicensed operators work for money, trouble is when you work out where you can fly without a license don't expect it to be anywhere convenient. Those helipads are literally everywhere. And you are not allowed to fly within 3nm.
UOC holders are permitted to fly under 400ft (or whatever restriction their PPL, or RPAS Level 1 allows) anywhere except towered aerodromes. And UOC holders can also apply for area approvals for exemption to these restrictions too (for a cool $480 each approval). UOC holders can also set up permanent danger zones for frequent flights in one area.
The other main issue is that unlicensed UAV operators are not insured. No aviation insurance provider will insure you without a UOC, and no employer or client will contract you without it at least $20million liability cover.
So while the rules are being relaxed, you will still have to conform to industry work place health and safety, insurance and specific professional requirements as a worker and you can't do that with out the UOC.
Typical CASA cart before the horse.