AEDs cost too much, that's the real problem here.
I think this is a chicken&egg problem: such requirement would be expensive initially but as the production of AED scaled up prices would drop.
Obviously training is required too, I'm not sure how feasible it is to get large fraction of population trained...
In which country is it mandatory?
> In the following countries it is compulsory to carry a first aid kit in your car:
> Albania, Armenia, Austria, Azerbaijan, Belarus, Belgium (locally registered vehicles only), Bosnia & Herzegovina, Bulgaria, Croatia, Czech Republic, Estonia (company cars only), Georgia, Germany (locally registered vehicles only), Greece, Hungary, Latvia, Lithuania, Macedonia, Moldova, Montenegro, Romania, Russia, Serbia, Slovakia, Turkey, Ukraine
Check out the link, it also has color coded maps for first aid kit, fire extinguishers and high-vis jacket requirements.
The first aid kit also usually means required first aid training as part of getting a driver's license. However I don't know if any countries require refresh sessions, so most people probably forget all except the basics.
[0]: https://www.safetyfirstaid.co.uk/what-do-i-need-for-driving-...
First aid training and an exam are also mandatory for getting your driver's license in many countries.
[0] https://www.oponeo.co.uk/blog/mandatory-equipment-for-vehicl...
An unused (hopefully) defibrillator needs to be periodically checked for battery levels and (I believe) some sort of diagnostics run to be certain that when/if needed it will be efficient.
Like with fire extinguishers or other periodical checks, most probably this must be done by someone qualified/specialized, which may represent a non trivial cost, I wouldn't be surprised if it was something in the 200-400 Euro/year or something like that, and probably every n (5-8?) years you would need to replace the device with a new one.
Besides, there is an issue (in non-restricted access placements) about theft and vandalism.
Vandalism and theft sure are problems, placing them in locations with either camera surveillance (bank foyers, gas stations) or 24/7 personell available might be solutions to these problems.
It has been introduced by Law only recently here (Italy) in a number of public places, and there are a lot of perplexities about the bureaucracy connected, the reliability of this or that model (or manufacturing firm) availability of spares, legal responsabilities of the provider, etc.
I believe (but I may be wrong as - as said - they are not yet common here) that the trend is towards some forms of "service" or lease/rent for the devices including their maintenance and all the bureaucratic paper and electronic work (by Law the device needs to be "registered" on a "online map").
Costs at the moment for this latter approach (rent + service) start from as low as 20 to something like 60 Euro/month for 48/60 months contracts, AFAIK, and they include an insurance against theft/vandalism, but it has to be seen how it will work out.
Some details of the norms around these are not clear (yet).
Most business have one here in Sweden and almost all public places like train stations, malls, hotels have one. Most taxis carry one to and can be alerted by 112 (the SOS number operators, 911 in the US) if they are close. Rural areas are the unsolved problem that these drones might help with.
How it works here is bigger business and public places have them - the public ones are in little boxes and the 999 operators will tell you where they are plus give you the key codes (I just checked and surprisingly my city has roughly six public ones for every 10,000 people, not even counting the ones routinely in ambulances and DC police cars)
I doubt putting it in every car is cost effective.