Satoshi knew that one day quantum computers will exist and will be able to move the early mined coins (P2PK) and created an unofficial prize competition to accelerate the development.
Maybe Satoshi created the greatest prize competition and the privatekeys are somehow within the blockchain.
Our guess is that he knew that the early mined coins will be moved one day. So he created a 'prize competition'. Otherwise he could move the coins to quantum resistant P2PKH addresses, but he did not and is not doing.The only question is:
Who will win the race and get the early coins?
Quantum computing or solving the "Satoshi Prize Competition".
Nobody can stop that race.
Nobody is asking why he is not moving the early mined unmoved P2PK coins:
These early mined unmoved P2PK coins are intented for an unofficial prize competition
https://bitslog.com/2013/04/17/the-well-deserved-fortune-of-satoshi-nakamoto/https://bitcointalk.org/index.php?topic=175996.0But he had other computers to mine and his own coins are unknown (P2PKH or P2PK not included in the above mentioned coins)