Detroit had the same problem with copper wiring in street lights until a few years ago, when they went LED and were able to reduce the size of the conductors and switch to aluminum, reducing the value of stripping them for scrap.
No. The problem was in the 70s, with single strand solid conductors which were legal for only a few years due to fire hazards. Multi-strand aluminum is still used all the time. The single strand can work itself loose if installed quickly/without proper care due to expansion and contraction, it's not a concern for multi-strand. Single strand is also ok for a dedicated line to a single appliance / load, which is what these lights would be.
There is functioning aluminum wiring all over the place in america, still operational to this day. I just has problems with overheating and catching fire if the load is too big. If you know the load will never change...
Oh, I know the feeling. In my hometown in Brazil they've installed these very tall LED poles with spikes because of thieves. People here will even steal your old thongs or plant vase if you leave them outside. It's insane.
Many people in first world countries will. Some people in first world countries and probably most in Indian villages don't even have 4g yet. So I doubt that in 1000 days they will have 5g when we are barely producing any devices today with that capability.
The reason they don't have 4g now is mostly because there's no 4g service, not because people can't afford 4g enabled phones. I'm pretty sure by now 4g phones are just as cheap as 3g phones.