In Australia the 400 feet rule only applies in controlled airspace and we have plenty of non controlled airspace - even over capital cities.

I live less than 20 miles from Sydney International Airport yet the airspace is non controlled up to 2500 feet - I can legally fly this high with no issue. See item 7.2.1 Para (c) below (highlighted in red)

These are the rules directly from the CASA website. (our version of the FAA)

FPV is technically prohibited by para (d) below.

Many local parks prohibit model aircraft with a sign clearly displayed - I am lucky that my local council allows it. I cannot fly if there is a sporting event in progress but common sense tells you that anyway.

These rules are generic for the hobby aspect of flying RC - there are other rules for certified UAV operations

If you buy a drone from a hobby store they will likely hand you one of these brochures also that gives a quick summary of the rules.




7. MODEL AIRCRAFT SAFETY CONSIDERATIONS

7.1 Model aircraft flying - all models

7.1.1 First,
choose an unobstructed site and at all times keep a safe distance from:
(a) persons;
(b) vessels;
(c) vehicles;
(d) structures.

7.1.2 Then,
only fly:
(a) in suitable weather;
(b) with regard for any other conditions such as local bylaws;
(c) with due consideration for other people and property.

7.2 Models weighing up to 25 kg

7.2.1
Unless approval has been obtained beforehand, model aircraft should only be flown:

(a) when the weather is suitable;
(b) clear of the movement areas or runways of an aerodrome;
(c) below 400ft above ground level unless:
(i) clear of controlled airspace, and
(ii) further than 3 nautical miles from any aerodrome:
(d) within sight of the operator at all times;
(e) well clear of populous areas;
(f) at least 30m clear of persons, vessels, vehicles or structures. This can be reduced for persons behind the direction of take off. Other model operators and any assistants or officials may be within this distance; as may vessels, vehicles or structures under their control.

7.2.2
The following factors should be considered:
(a) incorporation of an appropriate ‘fail-safe’ mechanism;
(b) ensure that any load carried on the model is secure;
(c) flights must comply with any other conditions such as bylaws.