1.The keys are definitely owned by their creator/creators.
- He/They have not moved it since he/they believe in the future of bitcoin (to the moon)
3.Perhaps when the total supply of bitcoin reaches its cap they will use these 1 million coins to keep paying miners. By then the price of 1 bitcoin will be around $500,000-$1,000,000. So with the increasing difficulty these million bitcoins can payout a lot of miners