Well, you have asked a lot of questions. But I will try to answer few of them!

Bitcoin is not likely to be impacted by the free energy disclosure if it happens in only few countries. It will only impact if free energy is distributed in all major countries where bitcoin is mined. As the production cost decreases, the miners will be able to sell it at a cheaper rate which may crash the price! But let's not imagine unimaginable things like free energy worldwide! That's not gonna happen, at least in our lifetime!

Mining can't be free even if electricity becomes free. Rather the hardware cost is likey to skyrocket because a lot of people will then become interested to start mining! It will increase the demand of mining hardware which will push the price of these already-costly equipments to another notch higher!

More people mining means, network difficulty will increase! More difficulty means, more update hardware requirement and more updated hardware requirement will increase the initial set up investment of every wannabe miners!

Understand the chronology! It's a never ending cycle!